Picture of Knex powerful semi-automatic gun
This is a gun I made which was originally a grey connector speed reloader, but I modified it into a powerful gun. It has 6 round cap, but I might post a 23 round cap version sometime, if you can't work out how to (just extend, and replace the yellow push rod with a grey one). To fire push yellow rod up until it fires.
Semi automatic
Quick reloading
Low piece count
No trigger (push rod to fire)

Step 1: Piece count

Please correct me if I get it wrong.

Green - 7
White - 12
Yellow - 1

Yellow - 8
Orange - 4
Dark grey (excluding ammo) - 4
Red - 4

Black Y-clips - 2
Elastic bands - 1 needed, 2 wide ones recommended, you can use just like 10 quite thin ones

Total (excluding bands and ammo):
Larscool1 year ago


Louis XIV (author) 2 years ago
Hi guys, I thought I'd log in for the first time in about 3 years haha, 17 now, thanks for all the comments :) I don't do Knex any more I'm afraid, I'm focusing on music these days but I hope you've enjoyed what I've left ^_^
If you push the yellow rod up (or down, depending on wich way you hold it up) really fast then it sorta becomes a fully auto gun!
ok if somebody will make this into a gun with trigger and stock and barrel, and everything tht makes a gun a gun (obviously) i would love to see it, believe me...ive been trying insane amounts of my time are going into trying to do it...and its not working =/
rlaxrlax3 years ago
one of the best guns on this site!
I dont think you're still on the site which is really sad seeing that YOU started new era of knex. This gun, as simple as it is, is becoming the basic blue print for semi auto knex guns. You should be quite happy!
mberg4 years ago
behold! i give you! the powerful knex semi automatic gun 2!
i made a bigger version. it holds 8 more bullets (14). i can't make it any bigger. is it ok if i made a youtube video about it?
qwerty20084 years ago
I have found several ways to make this into a removable mag.
qwerty20084 years ago
I got it to fire without any rubberbands
qwerty20084 years ago
I have extended the mag to hold 18 shots 5 star
qwerty20084 years ago
this gun is awesome must has more
This is officially the mystery gun- I cannot explain hoe this thing works!
18 round fully-automatic uzi anyone? >=D
maybe you can put a trigger that will stop the fire then when you pull it down, it with blast all the rounds because the mag pusher has too much force on the bullets and when you release the trigger or pull it down, the rounds will fire like crazy
too bad it isnt fully auto....is it? if it is i bet it goes 2 feet.but i doubt fully auto
yea, it's an extended version of louis's gun which holds 18. i just added a frame to make it look cool =D. btw, it shoots like 20 feet at like 10 rounds/second, lol.
Too bad it doesnt have a trigger.
Louis XIV (author)  combatknex6 years ago
If it's using the same system as mine, then it is fully automatic and has more or less the same range. You just push up on the follower thing and it'll keep pushing rounds out.
lemonpickle4 years ago
when i fist saw this I thought it was a piece of crap but now that i made it its awesome 5*
MegaMetal84 years ago
WOAH, built it. I LOVE IT 5* AND SUB
KnEx_MaStEr4 years ago
this is a true semi auto cool!!! i built
skelly74475 years ago
best gun on the site!!!!! P.S. leave a reply if a knex gun has ever exploded on you
st j skelly74475 years ago
i am canadians SPIFF exploded, the magazine did a dump and it hurt my fingers
skelly7447 st j5 years ago
i am canadians striker pistol, actually my modded version. Striker rifle exploded. whole barrel flew off. it didn't hit me but the thing wayed like a half pound and it flew backwards like 20 feet
some oodammo gun, cant remember which. got the mag wrong, and when i fired the whole thing blew up in my face.
dun no name of gun but it was a sniper and i aimed it right at my bro's head and i pulled the trigger and the whole thing blew up in my face.
Oh COME on! No offence, but how the heck did this reach the first page?!
Because it introduced a brand new firing mechanism that was never done before in knex. It is very innovative.
I stand, corrected.
skyfaller4 years ago
You could take the bottom of the thing you push, and use it as ammo. Place a single slot small blueconnecter to replace it.
Sorry, I meant blue clip
claytonjai4 years ago
claytonjai6 years ago
wot's a Y-Clip?
a little black conector about roughly 1cm
danbaha5 years ago
Very inovative!
nice little design. 5 star!!!!!!!!!
Alright...so i did that upgrade you sad by building it bigger and i shot it and it fires twice as far...also i pushed it completely to empty the mag  and shot over 20 bullets in less than one second
 Omg I love this thing i just built it and shot it and I first accedent ly shot all or them at once!!!!!!!! love it
~Z~5 years ago
 Wow. Nice! 4.5*
The Jamalam5 years ago
I might mod this for a full gun.
1181185 years ago
This is the best gun ever!!!
it's easy and its awsome
i thank you for building this
youve nearly got full auto :)
If he adds a strong RB to the yellow rod and a white rod to the red connector o nthe front to keep the ammo back, he'd have full auto.
Sasha255 years ago

X19OV16 years ago
I've modded this gun so the rod comes from the side instead of the bottom, so you don't have to worry about that anymore. There are a few other noticeable differences, but they're not too important. I'll post the mod if enough people ask for it.
Chikara X19OV15 years ago
a little late, but would you please just post a picture? im interested in it
X19OV1 Chikara5 years ago
Sure, but I have to build it again.
Chikara X19OV15 years ago
almost done building it? ;)
Chikara X19OV15 years ago
coolsauce, thanks
KnexFreek5 years ago
i dont get it..... so im gunna build it to see how.
ill tell u how it went when im done.
now i understand! i built it and its great! im making 10 and having a war tomarrow!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
4.5 stars!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
GREAT JOB!!!!!!!!!!!
i even subbed and im making this into a forum topic!
wietzaa1215 years ago
knex_mepalm5 years ago
my fridns think its a staple gun, this really uses your strength toshoot, the rubberband is to only control your force.
Chikara5 years ago
i made it shoot multiple bullets in a stream... rofl! i gave it a trigger and it goes PPPPPFFFFTTT!!!! when shot its hilarious
Lol, when i first saw this i thought it was a mag :p
J Moneyman6 years ago
how far does it shoot, and where's the trigger?
hey man do you can make a thing with a cinda same power but other elastick (rubber bands) couse i only have thick rubber bands which are stronger and fore harder
stopanator6 years ago
i made gun out this i mean true trigger gun
stopanator6 years ago
post 23 round alread!!!lol i made a like 30 round
dude106 years ago
This gun is awesome! Nice design good power
How to you do the white rod connecting the two red connector two eachother in the first picture?
Never mind got it.
Actually no didn't LOL
Sting Teddy6 years ago
Such a good gun!! I incorperated it into the handle of a knex knife blade so people don't even know what's coming! 5*
full auto uzi? sweet. all the other uzi's on this site you need to pull back a ram and shoot which sucks
oh yea and i also added a rubberband on the trigger thing that you push up so when you lift the red connector up it will fire all of the 17 rounds in about a second!
i modded it, it now holds 17 rounds
P.S. great work 5*
cj814996 years ago
I made one but moded it i will post the mods i made like the stand and longer mag/whole gun. reply telling me you want to see the mods
please post the mods PLEASE
ill post the mods after 1 more person asks
stale56 cj814996 years ago
I think you should post also.
cj81499 stale566 years ago
im sooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo sorry i just took it apart to make a rbg!
ok ty
what is ty
"TY" is short for "Thank You"
cj81499 cj814996 years ago
iv sen people use it a lot on the site
cj81499 cj814996 years ago
ooh yeah i also put the rubber bands on a different way
Max Stryker6 years ago
please tell me wer to put the rubber band!
Louis XIV (author)  Max Stryker6 years ago
One end goes round the white rod at the bottom, then it hooks over the red connector at the top that holds the rounds in, and onto the white rod on the opposite side. Hope that helps.
cj814996 years ago
this gun rocks!!!!!
blingblong6 years ago
whoa this is sick man. you dont need to fire locks you can fire green rods. i shot myself it hurt alot! i had like 7 reallly tight rubberbands on with a green plz reply
Louis XIV (author)  blingblong6 years ago
Lol cool, is there much difference between shootin greens or greys? I destroyed mine ages ago and I dont feel like building it >.<
greys are a bit longer and are taller so less fit in there but green rods slide around a lot in the body and stick to each other, they are also incompatitable with the trigger which needs taller bits.
SonicX 226 years ago
it would be impressive to see someone to make a gun without a rubberband
Ima make a mega uzi with this! 18 rounds in less than a second! (if u want) =P
One of the best! 5*! Pocket semi-auto ftw!
a really nice gun, i have made it longer. I gonna make a real trigger on it as it can
This is absolutely brilliant, and one of the best guns I have ever seen on instructables. Good job! (Runs off to shoot someone)
oh and its also a dual shot semi.hit trigger hard and it soots 2 or three and i give it a 5
OMG this is awesome!
this gun can achieve extreme fire rates especially with a 23 round mag!
DrWeird1176 years ago
Wow, it's now semi, full, AND BURST!!!
Why did you change your picture? lol. The guy was cool.
Hank Hill? It's now a flamethrower toy soldier who's on fire, and it says Fail-o-rama.
Thanks, I created it.
DrWeird1176 years ago
I turned it into a grenade with ONE MOD!!!!
oodalumps6 years ago
I wouldn't call it powerful, but it's good.
hey oodalumps, since youre the king of semi-autos, i have a question: is semi-auto where you pull the trigger, but to fire, you let it go? if not, what do you call that mech?
That is RBGRODD. It fires rods or connectors, but like an RBG, you need to release the trigger.
It's not semi-auto to pull the trigger and let it go to shoot. That's kind of like shooting a bow and arrow with a magazine. I would just call it a repeater, like any gun with a mag.
Louis XIV (author)  oodalumps6 years ago
If you add enough bands it does 15m, which I would call powerful.
I hope you mean 15 FEET. I put as many rubber bands on it as I could without it breaking and I got about 15.
Louis XIV (author)  oodalumps6 years ago
You can't break it, the more bands you put on the harder it is to fire, that's all. I use 6 bands and that's fine.
snipeyouout6 years ago
i extended it
Wafflicious6 years ago
worked best for me as an ammo holder. ;)
Wafflicious6 years ago
lol i made killerk's magnum and sniper right b4 this so now i dont have any greens or whites left... im glad this doesnt shoot them ;)
apples!!!!!6 years ago
Pretty good, might turn it into a gun.
btw our grandson's a loser...
I meant "your" instead of "our" LOLOLOLOL
Louis XVII......the fat loser king of France....haha.....
T.E.A.6 years ago
makes a great sidearm
yerjoking6 years ago
Wow, I made a semi auto, and it works alot like this, except mine had a trigger, I never copied off you because I've only just seen this, I might try mine again...
The Jamalam6 years ago
the piece count is wrong
Louis XIV (author)  The Jamalam6 years ago
Thanks, I've corrected it now
white rods
Storm9506 years ago
Make this a grey rod length pusher. Put it on the floor, and push down! Then you have your self a fairly sucky but very fast full auto! :)
Storm9506 years ago
This is pretty fun! :)
alfpwns6 years ago
AWSOME!!!!!!!!!!!!!!!!!!!!! But some1 will rate it down trust me some1 out there hates knex and rate it LOW! 5*s btw
Oblivitus6 years ago
It's kinda cool, but someone should really make it into an actual gun.
DRADIS6 years ago
This is brilliant
I made this beforehand and it's fun to play with.
Pretty good!
yannyboy6 years ago
YESS U POSTED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!