Introduction: The K'nexecutioner 1.02

Picture of The K'nexecutioner 1.02
At long last! I show to the world how to create your own copy of my beast, featured on YouTube.

Version History:
0.1a - Alpha tech release - Inspired by the Oodalumps chain-gun, the concept of a heavier ammo that used two gear-belts developed. This model, rather bulky, performed the job of firing a single belt of the new ammo and convinced Danny "Stealth Raptor" Ogran to lend parts for a bigger, better model.
1.00 - The K'nexecutioner - Construction went smoothly and without any major problems. Very shortly after its completion and first test-firings, videos were taken. A complete success, it was publicized on YouTube with the video above and various forums to a crowd eager for building instructions.
1.01 - Extensive modifications to the structure were made to allow for a better wheelstand and a foldable third leg. This allows the weapon to be reloaded by a single person.
1.02 - A modification to the gear ratio showed that high torque was not necessary, and the gun is capable of firing faster. This version was chosen to be in-depthly featured on
2.00 -Cyclone- <Declassified>

I'll tell you this now: This model is very difficult and time-consuming to build. Only the serious K'nex gunners need attempt this.

The first ever machine gun built to fire rods of the yellow size! And it capably carries them a good (not great) distance.

The video shows it at an old, very powerful gear ratio. I have since simplified it from the motor having a small->large gear advantage turning the barrels into the motor directly turning the barrels.
40 shots over 10 seconds = 4 per second = 240rpm.
This has been boosted to take a little under 5 seconds, so 500rpm will be my official claim.

Since not everyone uses the same K'nex motors as myself, yours may have to vary and you'll need to be creative. Use this instructible as a reference, rather than follow it completely.

Step 1: Let's Get the Most Boring Part Done First.

Picture of Let's Get the Most Boring Part Done First.

Here, you will find out whether or not you really have the pieces necessary to build the K'nexecutioner.

You are building 42 single-shot chain link units.

21 are for one side, and 21 are mirror-flipped for the other side.

You can build yours however you want, as long as the red connectors & chain links are exactly where I have them.

I used 8 dark grey connectors per barrel, 8*42=336! Whew.
84 black chain pieces.
84 light-grey connectors.
84 red connectors.
126 silver-grey spacers.

That's just to list a few of what you'll need if you do it exactly my way.

I also reccomend these exact rubber bands. You can get them in the office supplies section of Wal*Mart.

Step 2: The Central Brace and Front Handle.

Picture of The Central Brace and Front Handle.

Have to start somewhere... If you need more pictures, of perhaps the handle or something, ask.

Step 3: The Front Brace and Wheel-stand

Picture of The Front Brace and Wheel-stand

This section has gotten a makeover since the making of the movie that everyone saw. Wheels are actually the best thing, since they don't break and bend when you try to turn the gun while it's on the ground; they just roll.

This part is symmetrical, so the pictures only follow one side, through its front and back.

Step 4: Attach Central Brace to Front Brace.

Picture of Attach Central Brace to Front Brace.

It should be fairly obvious where the two parts connect.

The handle has two rubber bands attached to it. Their pull adds a small amount of comfort in holding the handle, which otherwise remains perfectly vertical when being held.

Step 5: The Dual Motorized Gatling Modules

Picture of The Dual Motorized Gatling Modules
These parts have also recieved some tweaking since the making of the film. The power ratio has been decreased in favor of speed. Take care in making sure the motors move as they are supposed to now, because it's a real big pain to go back and disassemble these units.

Both the sides are identical except for their motors, which face opposite ways, and the sections that will later connect the modules to the rest of the structure.

The old ratio is also pictured, if for some reason you want it like how it was in the video.

Hopefully, this movie will help explain the motors.

Step 6: The Structural Cross-member.

Picture of The Structural Cross-member.

This section is purely skeletal - it has no function other than to provide structural stability for the K'nexecutioner. It may not seem impressive at first, but once the entire thing is complete, you'll find that it's quite sturdy, as it needs to be.

(If you haven't noticed by now, I prefer to have my K'nex models built very strong)

I've split the section in two halves for the pictures, so hopefully this isn't too overwhelmingly complex to copy. I don't think it is.

Step 7: The Rear Handle, Third Leg and Motor Control.

Picture of The Rear Handle, Third Leg and Motor Control.

This section of the K'nexecutioner may vary drastically with yours because you may not have the same motor system as myself, which is 2x of the #1 motors from the K'nex Cyber Ultra set.

If you really have no idea how to set up yours, you can skip this step and deal with it later, once the rest of the K'nexecutioner is built.

Just know that this piece is to be the second handle with which you use to control the motors from and hold the weapon. The entire weight of the K'nexecutioner relies on this piece, so make sure that it is strong and well-mounted.

The third leg is bare minimum - It's not supposed to handle any motion or stress. It's just there to hold the gun while you reload it or leave it by itself.

I really don't know why I took so many pictures...

Step 8: All Parts Unite!

Picture of All Parts Unite!

Assembly time!

It should be quite apparent how all of the pieces fit together. Make sure that you don't miss anything, make sure all parts are correctly snapped (and not missing if it's obvious a rod should go somewhere)

If you had any confusion about the left/right motorized modules, it's okay. Correct them so it's a perfect fit.

It should, of course, look like it does in the pictures.

Does it seem sturdy to you? I think it looks really silly without the barrels on...

Step 9: Attaching the Ammo Belts.

Picture of Attaching the Ammo Belts.

The most important thing in this step is to not lose your head in frustration as this is way more difficult than it looks!

Be calm, careful, and patient in doing this. I know I had to be. And be ready to try several times.

The ammunition is built to only turn one direction. Be EXTREMELY careful using the motors in reverse! Going backwards, the triggers will catch onto the block that is meant to trip them, and you'll be stuck in a huge mess and probably have to detach the whole belt to repair it.

What you do is slowly feed the belt into the top gears (make sure it's the correct belt), very careful that they do not catch anything on their first way down. Use the motors to turn the belts farther until you're able to hold both its ends.

Eventually, you should have fed the belt 75% of its way through before you're at a good place to lock it all together.

Take off the bottom gun unit (the first one that was fed down), leaving the two red connectors on the black gears. Pull both sides together and link the gears. It should be a very tight fit, and it's quite possible you'll slip and end up detaching the gear-links in other parts and have to remove, repair, and try it all over again.

Re-attach the gun unit and repeat for the other side, then you're all set, unless of course you maybe haven't designed the back motor control yet. Good luck with it, is all I can say. (I'd love to see different versions if any of you guys make them.)

It's hard to attach, but so far, I have not had one belt failure due to regular firing/reloading use.

Step 10: Arming/Reloading.

Picture of Arming/Reloading.

We're so close to the fun part!

The best way to reload the K'nexecutioner is to stick it face-down on the floor. It is JUST high enough to allow the ability to stick rods up into each barrel. Nice, huh? The very same rubber bands that power the firing of each barrel also move the triggers into position. They perform this second function rather poorly, but hey, you've got two hands in case they fail. Usually, they don't.

You use the grey connecter/white rod thingy at the front of each barrel to hold each shot in position. It surprises me that this isn't seen in many other K'nex guns...

Fully-loaded, it should have 40 of the barrels armed. I know you made 42 barrels, but!!! Two of them are deep inside and there's really no way around this, unless you want the gun to be twice as long as it is.

You can use blue rods or yellow rods for ammo, but if you try to lock white rods in place with the mechanisms in front, it screws up their trajectory and they fly everywhere but straight.


Knex masterer (author)2015-03-11


If you don't have that specific motor, just use the Tethered Power Pack Motor from & if you need you can break the little plastic prongs off. That's how I'm doing it.

Knex masterer (author)2015-03-10

what kind of motors are those? What's the name?

Knex masterer (author)2015-03-09


But I don't have enough of the right parts

Knex masterer (author)2015-03-09

EpicMinecrafter870 (author)2014-12-04

i know what im doing after school

king greeon (author)2008-09-05

you are waaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa(you get the idea)aaaaaaaaaaay to old to be playing with knex guns

Perfect Duck (author)king greeon2008-09-05

I'm 22. O.o I don't really play with them. I get more enjoyment out of thinking them up and then designing them. Whenever I get an idea in my head, I have to see if it would work.

makes sense. i only make them for the challenge they bring; K'nex just get boring if what you're building isn't complicated when you think at hyperspeed like me.

Too true.

cool knex13 (author)2011-11-19

Great! :)

TwistedParadox (author)2009-03-27

I wish I had no.64 bands.........

go to an office supplies store and buy them they are cheap i got 1 pound for 3 dollars

I live in England and I don't know where I can find a office supply store. Wahhhhhh

Check out my forum. Do you think you could come?

Rly? Do you have staples there?

Yes, England has Staples.

Even England must have post offices. You're very likely to be able to get rubber bands there.

Asday (author)Perfect Duck2009-04-15

I didn't realise rubber bands had specific types. I thought... I dunno what I thought. That they had some rubber left over from making tires, and were all like: "How many rubber bands do you think that'll split to?" "4000!" "Right, cut it into 4000 pieces, and make rubber bands."

I might try there later.

Very true.

I'm English

Millawi Legend (author)2011-03-27

I've always longed to make this gun. Never had the 2 motors.

weadeadr (author)2011-03-13

plZ make piece count

Perfect Duck (author)2009-06-18

Not poker cards... Card protectors, which are thick-plastic sleeves that fit around cards to protect them from scratches - I used that material because it was both thin and stiff. It flies perfectly -and very far- but immediately shatters when it hits the ground. They really are a lot of work and I don't reccomend actually relying on them. I know what you mean. I did it more for myself because I was curious. I could have done a whole instructable on how to make them but agree with you that once you start going down the slippery slope of modifications, performance boasts do get rediculous. I'll still say that the Cyclone's the only auto that shoots sniper rounds, though, making it one of the top long-range siege weapons in K'nex arsenal if they're allowed.

Also, I'm really getting sick of you trying to descriminate me due to my age and trying to make it seem like I don't belong. K'nex are for anybody and everybody who wants to be interested in it.

Mace! (author)Perfect Duck2009-07-01

Thanks, I now understand what the flighted sniper rounds are. And I'm glad people like you make stuff like this cuz usually the older people make the best stuff. Ex: you and killerk

Doctor Freeman (author)Mace!2010-10-09

i agree older people do make the best stuff
Levels of experience:
Kids Ages 4-8 little to none and no creativity (well for their age they have some... dont forget their little)
Kids Ages 9-12 a bit more (creativity wise as you go on there's improvement)
Teens Ages 13-15 alot more than that (Createtivness has a lot more improvement)
Teens Ages 16-17 amazing experience (and creativity too)
Adults Ages 18- Master experience (and ultimate creativity too)

Mace! (author)Doctor Freeman2010-11-19

Yeah, I think I'd go by that too.

Doctor Freeman (author)Mace!2010-11-20

thanks for agreeing

why do everbody with DELETED_DELETED at the front of their names have (removed by author or community request) on all of their comments, not just that but they ''descriminate'' people, and when you click on their account this shows up (note this is his not everybodys when you click on his his name will show up not on the other DELETED_DELETEDs)
ERROR 400: no member: DELETED_DELETED_DarthVader
ERROR 400: no member: DELETED_DELETED_DarthVader

flyerminer (author)2010-10-17

OMG! i gotta make this. its the most wonderful thing in the universe....because this is so special im getting like 2 more boxes of knex.=)

Perfect Duck (author)flyerminer2010-10-17

This is terrible, build the Cyclone.

flyerminer (author)2010-10-17

out of the 5 boxes i already have. =)

Cagedconner (author)2007-03-01

WOW! this gun looks AWESOME!!!!!!! i dont have anywhere near enough pieces though

ultimatesx9 (author)Cagedconner2007-11-27

same here, how many boxes/sets did you use to make this?

whic pieces did he use for this

poilsoup2 (author)2009-12-21

what if we dont have 378 dark grey pieces?

murraylp2 (author)2009-12-03

does anyone know a parts list for this thing

prodo123 (author)2009-03-22

yo Perfect Duck can i modify your k'nexecutioners to not run on chains? instead im plannin on a moving box :D for those without chains like me

BuilderLoon (author)prodo1232009-09-03

Buy some on EBAY! I got 12ft of chain for £13.75 RESULT!

Perfect Duck (author)prodo1232009-03-22

The only thing that the K'nexecutioner is good for, is utilizing chain belts. I'd build something entirely different if it involved what sounds to me like a solid clip of rounds.

bighead5454 (author)Perfect Duck2009-07-10

you said the knexecutionor uses chains but what if someone shot one of those chains what would happen cause i wwould rather build a gun with a a mag than have a gun built that uses chains that if shot can disable the firing system

prodo123 (author)Perfect Duck2009-03-25

im just replacin rails with yellow connectors and put a green connector on top of gun for trigger so u just pull it to fire

I_am_Canadian (author)2009-06-20

Oh. Oops. It was so random, how was I to know?

Mace! (author)2009-04-28

Hey, where is the best place to get those motors? I got my first one from ebay but now I need a second one to build this gun. And don't just say get them from ebay because I can't ever find one on there anymore.

Mace! (author)Mace!2009-04-28

And judging from the cyber ultra motor I have, it doesn't seem powerful enough to power this thing, are you sure it will work?

Perfect Duck (author)Mace!2009-04-28

The belts actually resist very little when spinning. Also, forget this garbage and build the instead.

Mace! (author)Perfect Duck2009-05-01

I don't know, I kinda wantedto build this one more based on the fact that it has more shots before you have to reload......... But do you think the Cyclone is better than the original K'nexecutioner in a k'nex war?

About This Instructable




More by Perfect Duck:K'nex Dual Pistol setThe K'nexecutioner 2.11 - "Cyclone"The K'nexecutioner 1.02
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