Here it is: my cannon. It shoots large missiles, and shoots them hard. It is powered by 48 rubber bands, tied together into 8 strings of 6. It is 2 feet wide (on the bow) and 5 feet long.  It has an average range of about 100 feet shot from the resting position. It uses a ton of pieces, I know, though I might work on a smaller version later. If you do build my cannon, please know that I am in no way responsible for any damage done with it.

I have made a few other versions of this gun. Check them out!

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Step 1: Pieces

Here is where you'll find out whether you have enugh pieces to make my cannon. It uses a lot!

Just so you know, this list may be subject to counting errors.

Dark grey--------80
Light grey--------28
Yellow------------326 (ouch!)
Purple------------349 (woof!)
Blue--------------255 (dang!)

Red--------120 ( If you have them, 3 of those can be tan)
White------505 (choke!)
Green-----532 (dies)

Other Pieces:
Tan Cap-------------2
Black y connector-10
Silver spacer-------39
Blue spacer--------64
9 Hole panels-----8 (see second and third picture)
Medium Wheels--8

Toatal: 2820!

Parts list for the ammo



Aint nobody going to rob my house tonite!

Yttrium1 month ago

Very nice cannon. I bet very few people have the pieces to build it. Since I build ball machines, though, I most definitely have enough.

degah121 month ago

This inspired me to building on instructables

I dont have NEARLY enough peices though. not even enough to make the handheld one

add a white rod to the front of the shell to make it more aerodynamic. Also, DEFINITELY USE IN KNEX CTF.

whispersync3 months ago

yes they are

knexpert4life3 months ago
I love this gun i made this gun about 3 months ago and already i demolished a plant pot,exploded my knex box and a solid piece of wood!?? Best thing I've ever made
knex akbar9 months ago

reading the comments i'm not so sure if it's safe to build this thing...

Don't worry about that, it is very safe. As long as you be careful, because of it's structural integrity you will be fine. It's scary at first, but don't worry about it, just go ahead and do it! =D

I'm not worried about destroying something i'm worried about breaking my knex pieces XD

Hazza45318 months ago

I built this at a friends house over the holidays, fired the first shot which promptly went through a window, had to take it to pieces again :(

Pretty much tripling the size of this, and it is HUGE, and it is almost done! =D

Screw rubber bands! I use surgical tubing! IT IS INSANE, FOR I HAVE MADE A BIG MOD. >=) It shoots around 200-300 feet... I need more blocks of wood, nuff said.

I bought a pack of 2500 rubber bands. Alot of them are stretchable, and I used 48 of them.

Outside: The cannon shot the bullet 90 feet and almost broke my wooden fence!

Inside: VERY DANGEROUS, though it shattered a window. =-(

Elsewhere: It shot between 60-100 feet and caused potential significant damage.

I now realize when shoothing this thing I have to do it around open space, and maybe I should use less rubber bands.
You broke a window with it!?

That must have been cool. I wish I had been there :-)
I accidentally fired off the V4 inside, and it put a dent in a SOLID BRICK WALL! Here's a pic:
I call absolute BS. No way in hell a toy can go through a wall. You just took a few brick inches and put the, on a rug.

K'nex isn't really a toy anymore. If you look at some of the things it can do, with the right design and the right power, you would be absolutely astonished. I've had a K'nex gun that went straight through 3 soda cans and out the other side, completely destroying the cans. K'nex is a toy, but has the potential to become a deadly weapon.

wall is shocked as to why you would shoot it?
I_am_Canadian (author)  spazgadget3 years ago
indeed. i can only hope that when i finish this one, my cat doesn't stroll into the room and knock the trigger! KABOOM-SKI!
i used 80-something bands...
i modded the bow to have more torque, and i changed the barrel to have less friction. THEN i added WD-40 onto the barrel (a lubricant oil) and fired.

Power: it went through a fence, and out the other side, still going fast...

range: miles. and miles. and miles.

overall: absolutely f**king AWESOME!!!
Videos!? I want to see it, sounds fantastic!
knexinventer made it!1 year ago

Here is a pic of the one i built from this instructable.


I just finished this build and love it!

soccer91121 year ago
Who has built this cannon yet? If anyone has built this yet please put a pic up.
I built it years ago. I have a picture somewhere but on a different computer.
It is so amazing how you can just sit down and make this from scratch... or your imagination.... but imagination sounds wrong...
I_am_Canadian (author)  BleSam1122332 years ago
Cheers my friend :-) My origional ideas generally need quite a lot of refining before they are presentable though..
Well, it does feel good to sit down with your K'nex and make something from scratch and get it right the first time.
I_am_Canadian (author)  BleSam1122332 years ago
Certainly, but for me at least, that doesn't happen often.
knexerr1 year ago
I gonna build this thing and i have al de peaces, i am sure of that. But i don't no what he meens with the light and grey connectors and te tan cap things. Please help me somebody. With pictures is the handiest.?
knexerr1 year ago
Wich part do you meen with the tan cap, the light grey connectors andvthe dark grey connectors???
I wanna build it as its epic but I haven't got the pieces
soccer91121 year ago
who has has built this cannon yet?
cinnes11 year ago
In the parts list you havent included white connectors? Hom many would i need?
I_am_Canadian (author)  cinnes11 year ago
Ahh, I always miss something.. My guess would be around 20 or 30.. If you have enough yellow and 3d connectors, you WILL have enough white connectors though I am certain.
petey20001 year ago
how smart are you
OZKNEX221 year ago
Same I'm on this step
OZKNEX221 year ago
My fingers are killing me right now
dozer7892 years ago
Wow, cool gun! I am going to build it sometime soon if i have the pieces, -_-. 5 Stars!
I_am_Canadian (author)  dozer7892 years ago
Cheers! Let me know if you do end up building.. Best of luck!
I am going to build it sometime when i count and inventory my K'nex pieces so i know how many of every kind of piece i have so i can figure out if i can build things a lot faster.
almost finnished with this gun i am still building the trigger though this gun is heavy
arent red and tan rods the same thing?
No, the tan rods are reinforced versions of the red length rods.
RSV262 years ago
its like a MORTER
i doubled the size....
Photos please!
photo six on step 6: most difficult peice on the planet to build XD
knexguy2 years ago
Ah, the good old days. You know, I think I still have a chunk of this monster's trigger mech laying around almost 4 years later and I've not yet found the need or motivation to try and break it up.
I_am_Canadian (author)  knexguy2 years ago
Thats awesome :-p I know the feeling.

I'ma build another one sometime.
I look forward to seeing it!
~KnexBuild~3 years ago
This is awesome! 5 stars.
I_am_Canadian (author)  ~KnexBuild~3 years ago
I built a cannon that is similar to your cannon.
I_am_Canadian (author)  ~KnexBuild~3 years ago
Here are some pictures.
Pictures102711 088.jpgPictures102711 089.jpgPictures102711 090.jpgPictures102711 091.jpgPictures102711 092.jpg
I_am_Canadian (author)  ~KnexBuild~3 years ago
Sweetup! It reminds me a lot of my handheld. Thanks for the photos!
cool knex133 years ago
cool =)
I_am_Canadian (author)  cool knex133 years ago
Thanks :-D
how many of those do u think u can make
I_am_Canadian (author)  knexrmything3 years ago
Two at once, I think.
Awsome! Have ever tested it on someone?
I_am_Canadian (author)  PotatoCoffee3 years ago
Nay! Others have, I've heard. I think welts are the expected result.
Looks painfull! Would not want to be on the wrong side of it.
(removed by author or community request)
I_am_Canadian (author)  knexrmything3 years ago
spazgadget3 years ago
I finished this step! It actually is not as Painful as people say it is! All i need to do now is finish the bow!
I_am_Canadian (author)  spazgadget3 years ago
Beauty! Let me know when you're finished!!
spazgadget3 years ago
D'OH! just 100 short on blue connectors... fine on everything else. Ebay to the rescue!
I_am_Canadian (author)  spazgadget3 years ago
Grey_Wolfe3 years ago
Life sized ballista made of Knex, what more could a guy want?
TWO life sized ballista's made of Knex :O
Dual-wield heavy cannons. Like a boss.
Mag-fed Dual-wield heavy cannons. like a boss.

oh my,
Quontos3 years ago
are you Canadian?
I_am_Canadian (author)  Quontos3 years ago
builder9683 years ago
Works great! I love it! Here's what it's been so far-

shot 1- rubberband caught on something, misfire. Repaired in less than 10 minutes, took it back outside.

shot 2- shot about 75 feet, ammo somehow split in midair.

shot 3- shot about 85 feet, would have gone farther, but a tree was in the way

shot 4- shot about 40 feet, rubber snapped, will re-string and try again tomorrow.
I_am_Canadian (author)  builder9683 years ago
Not bad, I guess...

Just make sure that you are using the right bands, and that you are stretching them out well before you put the on.
Yeah I shot it a few more times until it knocked a branch off the cherry tree(!) and my dad made me take it apart.
You too! =-)
Yeah, I caught it on video! I watched over and over in slow motion, it was TOTALLY AWESOME! If you'd been there your eyes would've popped right out of your head!
Congratulations! You've certainly made an outstanding accomplishment building that HUGE cannon. You're sure one of the world's most talented K'NEX builders of all time. Great Job!
Thanks friend :-D
Your welcome! And I can see that you're Canadian. Because you have a picture of a canadian owl. Pretty cool stuff!
This DEFINETLY deserves a round of applause, 5 Star Rating, and of course the potential to win in a contest. You've certainly did an OUTSTANDING job when you were making this cannon. It is very large, very powerful, and shoots very long distances. I_am_canadian, you are my #1 FAVORITE KNEX-er in the entire universe!!! You show everyone what am amazing accomplishment you've achieved today and that is being the "World Champion Knex Builder". You're awesome, and there is no surprise that you get so many comments, and so many followers! Now here's the results that I have recorded when I was testing this cannon outside in my backyard...

Shot #1: I carefully measured the length of the shot... and I got: 90-100 feet!

Shot #2: I measured once again and the cannon shot a COLLOSAL 110 feet!!!

Shot #3: The shot unfortunately caused significant damage to some of the equipment in my backyard. Although, it still managed to shoot approximately 100 feet!

Shot #4 (THE FINALE): I used 1 more rubber band, and I expanded my shooting room in my backyard. READY!... 3... 2... 1... SHOOT! (OMG! It shot 115 feet! WOW! just WOW!)

I_am_canadian CHEERS for you. You are an amazing and INCREDIBLE knex-er. Keep on posting!
Thank you very much again! I'm so happy that you liked it. Its awesome to hear about others from around the world building my designs!

Stay safe and thanks again friend!
builder9683 years ago
Sorry if it seems like spamming, but I'm a little scared to fire this beast, because after 2 1/2 days of work, I don't want it to turn into the v5. I think that there's still pieces somewhere in my yard from that explosion.
I_am_Canadian (author)  builder9683 years ago

I'm still finding pieces in my yard, and I was shooting this thing around years ago.
check this out

nice gun
I agree step 6 was relatively complicated. It took me some serious considerable concentration, and after 1 hour, I finally figured it out.
builder9683 years ago
And I'm short 2 wheels. I have 14,000 pieces, and I only have about 6 wheels.
Nvmd. I found a whole bunch(apparently I still had part of the v4 built) of wheels and got a huge box of about 450 rubberbands. Building this right now, In the middle of the bow, need to wreck some more models for the blue 3d connectors.
I_am_Canadian (author)  builder9683 years ago
Let me know when you are finished!
I did run into a small problem, and that's that pulling 2 strings back at a time is very hard, but it's avoided by pulling back one at a time, and it should be easier to pull back once the strings are a little more stretched. Hopefully I can get a few pics and a video up.
Finished, looks great, hope to shoot off in a couple hours.
builder9683 years ago
Step 6 hurts so much! ARRRRRGGGGGHHHHH!!!! Anyway, my thumbs fell like they were thrown into the cracks of Doom and then stabbed multiple times. The only thing that makes me want to go on is the fact that it looks like its smooth sailing froom here. Then I get to blow my backyard to hell.
spazgadget3 years ago
ked19973 years ago
This thing is SICK. But I dont have enough parts for the first one you made so I need to settle for the handheld:(
I_am_Canadian (author)  ked19973 years ago
Thats a drag. Good luck with the handheld though!
smattman225 years ago
im on this step! yay!
Me to! :-P
rlaxrlax Jesus.3 years ago
me three
laserbeam3 years ago
i cant pull the bands quite far enough.
im an inch of!
I_am_Canadian (author)  laserbeam3 years ago
Stretch the individual elastics out well before tying them together.
bwells23 years ago
Would that be a giant sling shot?
I_am_Canadian (author)  bwells23 years ago
What else would it be?
arf2005 years ago
i cant feel my thumb still not done builing the triger
i use pliars
I feel like my thumb has had three liters of tequila and mij pointer has had that same amount yesterdaynight
laserbeam3 years ago
ive built it before and its soooo awesome i had to build it again
I_am_Canadian (author)  laserbeam3 years ago
Thanks! I'm glad you like it.
laserbeam3 years ago
is there a reason why on the bottom left of picture 9 theres no orange rods
I_am_Canadian (author)  laserbeam3 years ago
There aren't supposed to be any there :-)
mcoker3 years ago
It seems more like a ballista or a giant crossbow to me. A cannon usually implies there is some explosive force used to launch projectiles. But this has a bow with a rubber band string. But other than that, good job!! Really nice weapon. I can't wait to build it when my shipment of knex comes in. I already built the mini and it has done quite some damage on some cardboard boxes! =)
FlutterTree5 years ago
I'm REALLY scared to load 'cause when I had the micro the bow detonated on the second shot. (Although you'd expect that to happen on the first). P.S. I use #64's.
I_am_Canadian (author)  FlutterTree5 years ago
Don't worry, the bow on this one is much stronger than it needs to be.
when i bulit mine i had to dramaticly renforce the bow because it couldnt take the strain.
rangemaster3 years ago
I built this. then i made it bigger. we have just finished the Mk 5 and it is now 6 foot 4 inches long and can tear a beer can in half at 50 feet. just waiting for some latex tubing to power it and we are going for a record attempt. i use vastly modified rounds and a new rail system to gain a vast amount of power from what we call " Big jim ". will post videos on youtube when i work out how to link them here i will.
Knexman153 years ago
this is AWSOME!!!!!!!!!!!
I_am_Canadian (author)  Knexman153 years ago
lots of counting and pieces!!!
Its worth it :-)
_kira_3 years ago
Can you replace the panels with snow flake connecters? I don't see why not.
I_am_Canadian (author)  _kira_3 years ago
Yep! Go for it.
i would think so
ninjusk5 years ago
this is by far the best knex weapon ever

Not by far...
PICT0003 (3) edit.JPG
That is the most overrated gun I have ever seen.
that gun is horrible. i tried to build and i did, but you know at the scope where you put the blue 3-d connecters in? ya, i had to take those out because they were stopping the ram rod

Thats not better....
hey man, groove with it or lose it. if you hadn't noticed oblivitus's Z-35 is the most reliable sniper online. his sniper matches power 3 times that of any average k'nex sniper. the only weapons that are better than his Z, is killerk's SR-V2 and his TR-18
It isn't a sniper and it isn't 3x powerful than an average knex sniper rifle.  First of all, it's a direct mag fed gun which makes mag friction and decreases range.  I've made an assault rifle that's more reliable and shoots farther than his, and it uses a true bolt action mechanism that separates rounds from the mag.

Second of all, blue rods are not the best ammo for range, Yellow rods are better, then Red rods are the best.  If you are looking at ammo that uses more than 1 piece, oodammo is even better, and then Sniper rods (Red rods with tape at the end) are the best of all.
Your AR-4 v3 is really good, but I sort of like the Z35 better.
Despite the fact that my gun is more powerful and reliable than his, I can see why you think that.  His is more realistic with a detachable clip, and can get faster ROF.  His is more like a fun gun than a serious performance gun lol.
I didn't say and didn't suggest that it was.
My Z35 assualt rifle, look it up.
true  i  was not completely thinking when i make that comment.

in my mind   i have found many good weapons but this is one of my favs
(along with your z35, killerks sr-v2 and br 18)

This uses a lot of pieces! I'll make this after I buy more....

But this is by far THE strongest K'nex gun I've seen yet. I'd hate to be on the receiving end of that thing.
I_am_Canadian (author)  videogamemaster4 years ago
Good luck and thanks!
flyerminer4 years ago
that black tarp is gonna hurt in the morning!lol
Jesus.4 years ago
I'm making a new one. It's 8 Feet long! And 4 Feet wide at the bow!
It's just like this one only bigger. (So it's like a mod)
I_am_Canadian (author)  Jesus.4 years ago
I must have photos when its done! Good luck!
It's turning out to be a lot harder then i thought.
But I'll get you some pictures when it's done!
Prranavan4 years ago
(removed by author or community request)
I_am_Canadian (author)  Prranavan4 years ago
Perk1ns4 years ago
Darn, I have all the pieces required (even enough to give it the traditional color scheme, like you have) but I only have 2 medium wheels. I should be able to use Y connectors attached to snowflake connectors as substitutes, right?
I_am_Canadian (author)  Perk1ns4 years ago
Probably not, but smaller wheels would work.
Late reply, but never mind. While the Y connectors + snowflakes are not the best for holding the elastics in an unloaded state, they work well when loaded.
I_am_Canadian (author)  Perk1ns4 years ago
Cool! I wouldn't have thought of that.
I'm guessing that you could also use ball sockets instead of Y connectors (I'm guessing this would work better, but I cant test this as I only have 1).

Also, I word things pretty badly - I meant stretched/unstretched in my previous comment.
Perk1ns Perk1ns4 years ago
Wait, I lie. I mean the newer color scheme.
FINALLY done this step!!! i cant feel my thumbs any more :(
Better than painful thumbs I guess...
hey i have a problem with this cannon. when i fire it, the ammo exploads in the cannon and breaks the bow. can u please help me fix this?
Make sure that the ammo is built correctly first off. Be very sure that all the track connectors are clipped in, if not it will explode. Also make sure the bow isn't otherwise bent or anything. Thats all I can really think of.
can use this ammo for the handheld one two
I_am_Canadian (author)  mattiscool1144 years ago
Yes, just dont build the red connector on the back 3 thick.
hedzup4564 years ago
Mace!4 years ago
I built this a long time ago and had it together for like a year. It's really fun I liked to see what all I could explode with it.
I_am_Canadian (author)  Mace!4 years ago
Nice! Thats cool. I had fun demolishing random stuffs too.
i built handheld, and my mum was getting rid of this vase cuz it had a chip in it, do i blew it up........there was shrapnel EVERYWHERE...including in my eye...but AWWWWWSOOOOOMMMMMMMEEEEEEEEEEEEEEEEEEEEE!!!
imgonna build original when my weapon ban ends!
great instructions
the top barrel doesnt fit, whatever i will make it bigger
OMG I could make 2 of these!!! OMG
Make all 5 cannons!
make a knex Gustav!
try make 2 then make them guard your room!
make 2 and fire them at each other it'd be a knex explosion!!!!!!
dnmonsen4 years ago
can it go though a block of wood up close
I_am_Canadian (author)  dnmonsen4 years ago
I never tried, but I wouldn't be suprised if it did.
anres3214 years ago
This is sick !!! XD 5*
I_am_Canadian (author)  anres3214 years ago
laserbeam4 years ago
brilliant gun!
I_am_Canadian (author)  laserbeam4 years ago
Sting Teddy5 years ago
HOW do you have SOO MANY pieces IAC??? wow
I_am_Canadian (author)  Sting Teddy5 years ago
Dunno, its not that many really... Just from like 2 sets...
i have the big ball factory,pinball machine looping lizard 2 assortment boxes
I_am_Canadian (author)  101man5 years ago
Nice one!
This is all of my knex:
i have 1 box. lol. about the size of your red one. i have a lot of catching up to do.
Yeah, that's about what I have. Mine are organzined though.
wow-mine is all in toolboxes-so every type of piece gets its own compartment lol
sorry having problems with camera maybe in a month or so when i post my next ible
are you willing to sell those?
No sorry.
damn =/ if you know anyone who will please tell me D :>
you forgot white connectors
I_am_Canadian (author)  smattman225 years ago
Gosh darnit! Thanks for reminding me!
Wanna be friends? :D
I_am_Canadian (author)  smattman225 years ago
Okay :-)
me too!
yay haha
no problem :D
what sets?!? becuase i bought like 50 buckets of knex and its still not enough for this!!! i already built the small one and i building this one which makess 2 =)

i'm gonna attack my friends fort with these cannons thx!
wow i have the screaming serpent, big ball factory and the pin ball manchine and a small box of assorted pieces and I can't meet many of the requirments.
gamingman5 years ago
I think I might be able to make this. If I take apart the circle ball machine with no lift and the v5 cannon, I should have just enough. (But seriously, over 500 green rods? Are you kidding me?
I_am_Canadian (author)  gamingman5 years ago
Nice! Go for it! And yes, it is a major piece hog, its why I made smaller versions.
i know i am EXACTLY a year late lol. but wanna be friends?
i have 850 green rods = )
Okay, then. YOU WIN A COOKIE!
Jesus.5 years ago
i have like 900 green rods and 700 white rods!!!!!!
Jesus. Jesus.4 years ago
Now I have somthing like 1400 green's 1000 white's!! :-P
dnmonsen Jesus.4 years ago
How many pieces do you have in all?
Jesus. dnmonsen4 years ago
Bout' 19K. Or 120LBS.
Jesus. Jesus.5 years ago
i just built mini and it shot about 150 feet!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Jesus. Jesus.5 years ago
no mods
I_am_Canadian (author)  Jesus.5 years ago
Good stuffins!
dnmonsen4 years ago
how much does it weigh?
mulletman64 years ago
 wow - this is amazing .. i soo wanna make it. Going to have to take apart my Big Ball Factory to get enough purple + blue connectors and yellow rods. How big is this compared to your Heavy Crossbow? (I've got one built, so wanna know a rough size)
I'm planning on building this and bringing it in to school to shoot my art teacher in the nuts.
GeekBeam4 years ago
everytime i look at the v ideo, i think, "that's more for a paintball gun, than a knex war!!!" i also think, "THAT'S GOTTA HURT"
the_mooney4 years ago
Shaythegoon4 years ago
god   how much range?
I_am_Canadian (author)  Shaythegoon4 years ago
About 100 feet.
smattman225 years ago
im on this step now!
Me too!
Jesus.4 years ago
I'm going to build this!!
AND the heavy crossbow!
Jesus.4 years ago
I can build 2!!
wmanidi4 years ago
 Can you share pics of the dark and light grey counters I can't find them
harmenator5 years ago
pic 29 I run out of yellow connectors what of this is really needed?
never mind, I borrowed some from a friend
harmenator5 years ago
 Im gonna build the big one plus 4 ammo rockets!
Just check if I have enough pieces so lets count...
 what should i look up to find the little one?

what do you mean?
 people are talking about a mini
in the intro you find a couple of links to instructables of other versions, including the mini.
I_am_Canadian (author)  harmenator5 years ago
Nice, good luck!
Wareagle5 years ago
 wow.  that is all i have to say.  i was barely even able to build the handheld version. this is insane.  where did you get all of the pieces to build this?!?!?!?!
smattman225 years ago
jesus christ i cant figure this out!
I don't know what you are complaining about.
I also didn't understand it first but just start building and you'll get it.
harmenator5 years ago
I made a better handle because the original one is impossible to put in!
And its more easy to build and uses less parts!
harmenator5 years ago
 Are the red rods really neccisary because I forget them :( and it takes lots of blood, sweat and tears to put them in.
I_am_Canadian (author)  harmenator5 years ago
I think you should, but it shouldn't bee to difficult...
harmenator5 years ago
 I did this step in one row no confusion great instructions!
KILLERK5 years ago
more SPAM sry
saberwing5 years ago
5 stars for the sheer scare factor
ash115 years ago
 i made the hand held im making the big 1 :P

$100!!! That is an AMAZING price! I couldn't find one Screaming Serpant set for under $150! Where in the world did you get knex for that cheap?!!! Could you please tell me where you got all that knex?

Pizzapie5005 years ago

Hey everyone that knows knex prices! I bought this rollercoaster today
for $100. It consists of 2 rippin rocket sets, 2 screaming serpant sets, and 1 big air ball machine. It was 8 feet by 7 feet by 4 feet. This didn't fit into our minivan so we took it apart. Please tell me if I got it for a good price!

Rollercoaster 1.jpgRollercoaster 2.jpg
 Hell yes
Thanks! It came with the lights so on my next rollercoaster i'm going to put lights on it. The guy I bought it from said he spent $400 on knex and $200 on lighting. I cleaned all of the knex with bleach.
I didn't put a lot of bleach just enough to kill germs and make them smell good. They are still all the same color as usual and it didn't ruin the knex.
 ok then
Nice rllr coestar!! :) It's nice really......... oh and not a bad price for a roller coaster that big $100 ain't that serious, but the gun above is one hell of a price killer! XD, I'm not kidding I did a price estimate on this cannon a while back, and this thing costs like $500-$600. "THAT'S A LOT IF YOU ASK ME" XD.

Now that I think about it I'll make one of these and sell em for $400

Cool! I can make about 2 heavy cannons if the yellow connectors woren't needed. I only have about 400 yellow connectors
I_am_Canadian (author)  Pizzapie5005 years ago
Yes, you got a dandy deal.
Thanks, unfortunately it was in like 2000 pieces when we got it home. We also figured out he had a mouse problem or something, it smelled. So now we're going to wash each piece and bleach them. We've been working for 5 hours so far to take it apart.
KnexFreek5 years ago
 I FOUND A TYPO !!! OMG here change this: (this is on step 9)

Your loaded! So is your cannon! Be sure to shoot with extreme caution, never point it at anything valuable, such as a family member. I do not assume any responiblilty for and damage caused my this cannon. 

------------------------------ C O R R E C T I O N ---------------------------------

Your loaded! So is your cannon! Be sure to shoot with extreme caution, never point it at anything valuable, such as a family member. I do not assume any responiblilty for and damage caused my this cannon. 

The my should be changed to by.
It should also be "you're loaded" not your loaded.
heatblast5 years ago
Man if I sware if someone barreled this big mother F***er at me,I would probably scream like a girl and run the opposite direction ROFL! XD.
I_am_Canadian (author)  heatblast5 years ago
I think thats what we all thought.
I think General Custer would be offended if he saw this cannon LOL! XD
KnexFreek5 years ago
 Yo canadian, you better watch out, ive got a gun coming out soon that will take over ibles as we know it. Heres a few hints: Uses 350 yellow conns, Pump action, Magazine fed. LOL its big, and scary.

If you have skype and want to see the gun, my skype name is kevinc9933
littleebay5 years ago
hi i just wanted to know if you have ever tested this monster at point blank , if soo what was the outcome ?
smattman225 years ago
WOOHOO! NEW PRO ACCOUNT                           TEEHEE
I_am_Canadian (author)  smattman225 years ago
Pizzapie5005 years ago


Now the logic bow and repeating crossbow has past this in rating...
holy crap! People aren't rating this any more XD
Pizzapie5005 years ago
Um, I have all the pieces except the 9 hole squares, is there anything i can do to replace them? I have only 5 (or 4). I have no idea what I did with them, before I had like 12+ of them lolz
I_am_Canadian (author)  Pizzapie5005 years ago
I show you right on the parts list page what you replace them with :-p

Got some 9 hole squares for xmas so after we stop going places on winter vacation, i'll build this.

you have enough pieces???
That is correct. 80-90 pounds of knex.
Damn that's a lot :)
Oh hehe I knew that...
DrWeird1175 years ago
Even after all this time, everytime I look at this, I think I'm gonna see a K'NEx SNW.
poilsoup25 years ago
i wish i could build... i nly have like 150 greens and not enough connectors
I HAVE to build this some time. What is your estimate of how long it takes?
I_am_Canadian (author)  Millawi Legend5 years ago
Oof, I dont know... Probably around... 5-6 hours, give or take how fast you build?
KnexFreek5 years ago
 hey what is the highest ratingthis thingo haz ever gotten? 4.4?
I_am_Canadian (author)  KnexFreek5 years ago
Dunno, I haven't been checking.
 well ok, so.. what is the highest rating that you have seen this gun get?
 - - w o a h - -
4.32 I think.
KnexFreek5 years ago
I_am_Canadian (author)  KnexFreek5 years ago
Thanks pal :-)
 no problem canadian! this gun rocks :)
kevin29015 years ago
uhhh.....I have 2 screaming serpents, 1 rippin rocket, and 3 of  these colored box things with knex in them and I still can't build this......

Anyway, I need the bottom barrel and half of the trigger thing.
I_am_Canadian (author)  kevin29015 years ago
Sorry, I dont know what to say really...
Hey I found on craigslist 3 Screamin Serpents..1 Corkscrew Canyon..Hijacker..Cyber Knex..10 Pounds Of Loose Parts in a total of 60 POUNDS! For $75! Too bad it's in NYC...
ThomasRex5 years ago
If i wanted to make the rubber band strings only 5 long instead of six to make it more powerful i think the bow would be able to take the pressure but do you think the barrels could. I have made it before but took it apart to make another knex gun and i am finished with tyhis one for tghe second time i just have to put all the big peicers to gether. And would you recomend i dont shorten the strings or keep them how they are because i want to shoot it at like 150ft.
knektek5 years ago
by far this is the best ible ive seen!
I_am_Canadian (author)  knektek5 years ago
Thanking you!
Pizzapie5005 years ago
Which should i build for a war? The Blazer Sniper or the Inferno
Btw i don't have many pieces left due to a ball machine that isn't finished yet and i might not have enough pieces for it either since it's about 20ft tall not joking. I'm working on one path and I finished the tower.
The inferno is reported to have mag issues, but the trigger is very good.
I_am_Canadian (author)  Pizzapie5005 years ago
Go for the blazer. And, I want photos of the ball tower.
~Aeronous~5 years ago
holy. F@#$ing SH#T.
NYPA5 years ago
Pizzapie5005 years ago
You should include rubber bands in piece count.
Pizzapie5005 years ago
Oddly I can't reply... which is weird it leaves me at the waiting screen/thing. And I can post pics sometime this week. But i'll warn you it's just a tower and a part of a path but the tower is 20ft and i do have enough chain.
Woah i can reply to my own comment but not to another... Btw what sets did you buy?
I_am_Canadian (author)  Pizzapie5005 years ago
Thats odd.

I have: Big ball tower - Trampoline tower - Screaming serpent - a few other small ones.
Cool i Have like 6 of those boxes with various pieces. 5 of those amusement park rides mini pieces. Screaming serepent, Arcade, a tub that has hyper space training thingy, stego saurus, beginer set, advanced set. wanna see the instructions? My mom's camera only connects to her computer and i can't find the plug so it may take a couple more days till i can show u pics. Please w8 patiently...
psharpep5 years ago
Hey I_am_Canadian, would you consider editing this to also shoot sniper bullets? This is alot more powerful than the SR-V2, it's just the ammo is so frickin heavy! If you would include a lighter munition, this would be an epic sniper. Not to mention it would shoot at more than 200 fps.
arf2005 years ago
Thanks for the idea. Im going to take the v5 modife it and take the bow of this gun and use it this thing will be a beast
I_am_Canadian (author)  arf2005 years ago
Sounds sweet, good luck!

Finished it, but still need more ruberbands and time to test. I have half the ruberbands needed.

finmonster5 years ago
really cool gun good job
I_am_Canadian (author)  finmonster5 years ago
(removed by author or community request)
Dont spam please.
chazman25 years ago
2 sets what ever ive got about 14 sets and i have not got anoth yellow bits

or about 20 KG
I_am_Canadian (author)  chazman25 years ago
_kira_5 years ago
any knex gun i ever built i shoot my self to see what it does or how much it hurts, lets just say i went to the hospitable after a shot of this to the stomach
I_am_Canadian (author)  _kira_5 years ago
Sorry, I dont believe you.
Eh i don't care all i know is this gun is deadly and killerks srv1 lets a bruise on my stomach
_kira_ _kira_5 years ago
But i did
Pizzapie5005 years ago
Hey what is the best knex gun to use in a war? Which means low pieces,good ROF, good accuracy, and powerful? Btw your spiff is inaccurate butwhen I put a yellow rod with a red connector on it, it's very accurate.I can shoot a target that is 1in wide from 15ft.
I_am_Canadian (author)  Pizzapie5005 years ago
Try the TR Series by KillerK.
He doesn't have instructions...
I_am_Canadian (author)  Pizzapie5005 years ago
He has lots of photos though. Not too hard to make it from thems.

ok, I bought tons of pieces so i can make a big gun. So whats a good rifle type of gun that has good accuracy, good rof, and good range?

I_am_Canadian (author)  Pizzapie5005 years ago
Have you seen the TR series by KillerK?
...Look at what I said above...
And I like when guns have instructions...
j-chode!5 years ago
what a surprise even a year on and its still number one :)
I_am_Canadian (author)  j-chode!5 years ago
It seems to still be rather popular, yes :-)

Thanks! Good to hear from you, I have not seen you in a while...
i still lav it :)
and yeah not been around. crazy schoool days (N)
It is still the most powerful knex gun ever, so I can see why.
Hiyadudez5 years ago
OMG!!! OMG!!! OMG!!!
Is thats a star? What INstructable it it, it loks cool?
I_am_Canadian (author)  Hiyadudez5 years ago
Thats bizzare...
My folding knex star is the highest rated knex 'ible !!!!!!!!
knex_mepalm5 years ago
Wow, I have to subscribe, I've seen this before, but until I made it, I had not appreaciated the pieces I broke trying to shoot. Just amazing. Its first place, and what did it win? Subscription and 5* I broke at least 4 windows with this beast.
I_am_Canadian (author)  masterchief4425 years ago
They are the small one slotted grey connectors.
Picture Please! :(
I_am_Canadian (author)  masterchief4425 years ago
Oooohhhhh! THOSE Pieces! Ok Thanks! :D
Pizzapie5005 years ago
Do u know how many 38 pounds of knex is? Also is 38 pounds for $70 a good deal? Please answer ASAP cuz bidding ends today
Also is 38 pounds for 100$ better than Lost Mines:Power Tower Crane Big Ball Factory(Crankin' up the Big Ball) Hyperspace Training Tower Trampoline Tower Command-A-Bot(radio control) For $100?
I meant 38 pounds for $70
I_am_Canadian (author)  Pizzapie5005 years ago
I'm not too sure, but I can tell you that both are a great deal. If I had to go for one or the other though I'd probably go for all the sets. If you can afford/want both I'd encourage purchasing both though.
Um i meant which one has more pieces
I_am_Canadian (author)  Pizzapie5005 years ago
Prolly the lot.
Hiyadudez5 years ago
Hmm.. on the video, when you first fire it, does a bit of the bullet break off? Or a bit of the gun?
I_am_Canadian (author)  Hiyadudez5 years ago
Thats just a bit of the gun - there was a slight design flaw. It was fixed right away.
Ah, ok.
jtbuilder5 years ago
Hi I built this awesome cannon with my friend but when we try to pull back on the bands, they keep snapping in two. we made sure the track was the right length, and it was. I shortened the track by a few pieces but they're still snapping. Has this happened to you and do you know how to fix the problem???
I_am_Canadian (author)  jtbuilder5 years ago
Are you sure that you are using the correct type of elastics in the right amounts?
I am using size 64 rubber bands and made 8 groups of 6 of them
I_am_Canadian (author)  jtbuilder5 years ago
Hmm... Did you stretch them out fully before putting them on?
yes this is really hard to figure out
I_am_Canadian (author)  jtbuilder5 years ago
Could you make a video of the problem?
to tell you the truth, i dont have a camera I guess ill just try to execise the elastics before pulling all the way back
I_am_Canadian (author)  jtbuilder5 years ago
Yeah. And if the elastics are old get new ones - old ones are brittle.
i am still sad i am short on yellow cons idk bout green rods or white but i had all the other pecies for it
dbordy5 years ago
cool 5*
smattman225 years ago
Whats with all your comments on this ible??
I_am_Canadian (author)  smattman225 years ago
Just buy 150 off Easier and cheaper!
smattman225 years ago
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I_am_Canadian (author)  smattman225 years ago
Everything on that piece is in the photo, you just cant see it connecting. Its no big deal, just build it and you'll be good.
I_am_Canadian (author)  smattman225 years ago
Nice! How do you like it?
i cant try it yet!!!! D:
i modded it so it didnt hurt to build :) i is happy
smattman225 years ago
someone freaking reply!
Kinetic5 years ago
Ya- this things crazy. You have to make some videos of it destroying stuff-that would be great.
I_am_Canadian (author)  Kinetic5 years ago
I did! Ah well, its gone now. If you make a supercrazyawesome video of it destroying stuff I'll add it to the 'ible.
smattman225 years ago
im building now! but im not using the piece count its just a waste of time. so im scared! and if anyone is selling alot of knex for cheap im willing to buy!
I_am_Canadian (author)  smattman225 years ago
LoL! Good luck. I'm always looking for cheap K'nex - you dont find a lot of it just laying about, unfortunately.
Hiyadudez5 years ago
I_am_Canadian (author)  Hiyadudez5 years ago
novakfor35 years ago
I_am_Canadian (author)  novakfor35 years ago
:-D Thanks.
squarepants5 years ago
this deserves to be the highest rated knex weapon on the site-its truly mental
I_am_Canadian (author)  squarepants5 years ago
LoL - Thanks!
it must have the highest piece count of anything made out of knex-apart from some rollercoasters and ball machines-fine, any weapon on the site. am i right?
I_am_Canadian (author)  squarepants5 years ago
Erm, I'm almost posotive the vivisector has many more pieces.
ok fine, you win. By the way, would you check out my first gun, the knex falcon assault rifle? i'd like to see what you think of it.
I_am_Canadian (author)  squarepants5 years ago
Sure, I'll take a look.
jelmer22095 years ago
I have built them all!! v1 and v5 are the best
I_am_Canadian (author)  jelmer22095 years ago
Well, thanks awesome. AWESOME Thats sweet that you made them all! Congratulations! Thanks very much!
thank god im finally gettin more knex, b4 i couldnt even make the hanheld (i have like no green rods!!!)
I_am_Canadian (author)  PieMaster7775 years ago
Shweet! Let me know if you build!
i definetly will build, but wit the amount of knex in gettin ill probably be ably to make the first/biggest version =)
Wicky5 years ago
Finally got round to making this, I am just gonna count pieces and build the biggest possible version. I don't think I have 255 blue 3d connectors though =d
Wicky Wicky5 years ago
Ah, going for V2, because I have 166 blue 3d connectors xd
I_am_Canadian (author)  Wicky5 years ago
Awesome :-D Let me know how it goes!
Hmm I think I am done building everything, but the shops are closed so I'll have to get rubberbands tomorrow; which in turn also means I can't assemble it yet xD. I think this is the biggest weapon I have built till now, took me 5 hours including breaks =x

P.S Picture is a bit blurry, my phone doesn't like shaking hands while taking pictures =d
Foto0095 (Large).jpg
I_am_Canadian (author)  Wicky5 years ago
Haha, thats so cool! Make sure to strech out the elastics before you put them on - too strong elastics can make the bow blow up and hurt you badly! I learned that out the hard way seeing how much power the trigger could take...
Made a small tweak and loaded it up with 6x4 big thick rubberbands.
I don't think I can fire this outside, as I need a wall behind it to load it xD

I'd say that this cannon works really well, very powerful, but a bit hard to reload lol. Most certainly 5*'s. Wonder why I am commenting on this one though =x

Bit dark pics:

1 Backside of box
2 Front side(right through teh lego truck )
3 Blurry =x
4 Rubberbands
5 Knob snapped off trying to fire the first time xD
6 Took a 2xpurple connector out and replace with yellow, these snapped loose from each other whilst loading and nearly imploded the bow xD
Foto0106 (Large).jpgFoto0107 (Large).jpgFoto0098 (Large).jpgFoto0100 (Large).jpgFoto0101 (Large).jpgFoto0102 (Large).jpg
Yeah I always stretch them before putting them on, however I get the feeling that these are just a bit thicker xd

As a backup I also ordered what I think are #64's (had same thickness and length) at a office stuff site. They call em coupon bands here, or something =/
I reccomend making two of these things, mounting them parallel to each other on some kind of heavy duty turret, and making the ammo function as a bola. painful, but it'd work.
you should take off a good quarter of the barrel because my dad makes real guns (not as sick as knex guns) and he say theres a lot of friction with the ammo and the barrel so it decreases range
I_am_Canadian (author)  I_am_English5 years ago
But all the extera space for the elastics to power the ammo forward makes up for it no doubt?
yer but im going to take the top barrel only 3 quaters so less drag and fritcion so it would probably beat 200 feet and a good degree angle
I_am_Canadian (author)  I_am_English5 years ago
Okay, if it works, be sure for a video/photos! Btw, at a good angle this could already hit just about 200, so with that it would go much farther.
seriously dude, can you cannon even do major damage or considerable damage ?
I_am_Canadian (author)  heatblast5 years ago
i got mine to shoot about 400 feet strait up!
I_am_Canadian (author)  matstermind5 years ago
it was with my bullet (look down), mine goes a lot farther than yours
I_am_Canadian (author)  matstermind5 years ago
Nice. I still want a video though :-D
i'll try to get one made, it may take a while though
I_am_Canadian (author)  matstermind5 years ago
Thats okay.
yer im only going to have the barrel were the ammo is (on the upper part)
I_am_Canadian (author)  I_am_English5 years ago
It might not work, but you can certainly give it a go. Good luck!
thanks for the heads up ! but i already did, with your v5. i'm laughing my head off right now. dude, it was awesome... and funny as hell. when i had your v5 loaded i aimed it at this junk car from the scrap yard, when i pulled the trigger i amazed at how fast the missle was going, the funny and also scaaary part was the impact that caved the passengers door in... im not joking, it did ... it really did. i also thought it was funny for the fact that what if it was really somebody's car.
I_am_Canadian (author)  heatblast5 years ago
LoL! Photos at all? Sounds awesome!
meh didn't have time for photos or footage, but i did put a number or two on that stupid car. oh look it's flabber from the beetle borgs... heatblast: afirmitive i have visual on sight, im taking aim, booom. flabber: " miss me, miss me, now you gotta kiss me" !! heatblast: oh sh*t, im outta here !!
Mr. Cowboy5 years ago
Im not even gonna dare to even attempt it........... BUT I WANT IT SO BAD!!!!!!!!!!!!!!!
I_am_Canadian (author)  Mr. Cowboy5 years ago
Then attempt it!

I wouldnt even get done with one half of the barrel, not to mention the end of the barrel
not enough pieces?
benstir15 years ago
Yes I just finished it dude I cant use now because its almost midnight also I did some changes since I used small but thick rubber bands I shortened the barrel to 18 yellow connectors Also to save me some pieces I made the stand out of , love the design
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I think your the second to notice it. It saw knocked off because I had just thrown a couple more pieces on the back, and they got in the way of the trigger. I modified it right after so that doesn't happen. It just was a nice take of the cannon firing so I thought I'd keep it :-p Well spotted, by the way.
MotaBoi5 years ago
Hey guys if you don't have enough pieces... take a look at this
yessssssssssss!!!! i have enough pieces!
alfpwns5 years ago
i can meet most of the requirements exept the ones with the little expresstions at the end! i'm proud that i can say that
Jesus. alfpwns5 years ago
i think i can meet all of the requirements exept red rods and yellow conecters
gamingman5 years ago
This step needs to be used in prison as a torture device. OWWWWWWWWWWWCH!
I_am_Canadian (author)  gamingman5 years ago
which one was he talking about?
step 6
Jeez, i just cant get over how big this gun is.
I_am_Canadian (author)  Millawi Legend5 years ago
Its a little over the top...
hey i am canadian, how much tensile strength can this cannon stand ? i think surgical tubing is better because it has a tensile strength of 3,500 psi, but thats only 1/4th of it's actual power. here, this might help explain: Surgical Tubing Latex Physical Properties: * Standard Colors: Black or Amber latex surgical tubing * Tensile Strength: 3,500 PSI (Pressure per Square Inches) Minimum * Elongation at Break: 750% Minimum * Modulus at 300%: 190 PSI Maximum * Shore A Durometer Hardness: 35±5 * Specific Gravity: 0.95
I_am_Canadian (author)  heatblast5 years ago
I have no idea. I never tried adding all that much power, Because it would maim you if the bow split while you were loading up huge numbers of elastics.
what i meant to say was forget the elastics because they tend to break , however surgical tubing does not do that... it's life span is alot longer than a normal rubber band. i would recommend using it instead. hope that helps :)
Hiyadudez5 years ago
I Know this is really random, but i have nothing else to write: On Te yellow connector on the top of the bullet a tiny piece is broken off it where the green rod joins onto it.
that happens when you try to use pliers to join pieces together. (at least with me.)
If you do it right that wont happen.
I mostly use pliers to clip 2 rods together when they are filled up with connectors. Like Killerk's BR.
it happens on occasion though.
I_am_Canadian (author)  Hiyadudez5 years ago
Ah Yes. Ammo gets broken regularly with this cannon :-(
Raiden975 years ago
wow...i built this and didn't have enough yellow connectors for the ammo...time to switch some pieces
DJ Radio5 years ago
DEFINITELY shoot this at your annoying sibling.
I_am_Canadian (author)  DJ Radio5 years ago
Idea: In the intro, say "Warning, this is not a toy". That would be funny.
I_am_Canadian (author)  DJ Radio5 years ago
But it is a toy...
Yet, it should not be handled like one. Its a funny irony.
I_am_Canadian (author)  DJ Radio5 years ago
Meh, I used it like a toy... A big toy albeit...
DJ Radio5 years ago
I only have enough gray rods, tan connectors, Y connectors, and spacers. Thats it. =(
I_am_Canadian (author)  DJ Radio5 years ago
Ah well. Go get some more k'nex! I've been looking around, I have some ideas for some larger ball machines...
I got some knex shortly after I disassembled my OSSR. I wont be able to get any more anytime soon. Christmas at the earliest.
101man5 years ago
OMG if i brought this to a knex war everybody would hide behind a tree LOL
Actually, I did have to hide behind a tree with my wimpy blue-rod shooting gun. That's why I want to build it now.
I_am_Canadian (author)  gamingman5 years ago
You had a war with this thing?