Introduction: Semi-auto K'NEX Gun

Picture of Semi-auto K'NEX Gun

This gun is an 8 shot semi-auto rubber band gun with a twist, its made entirely from K'NEX!!! When you think about it its a very simple mechinism, i came across it while i was trying to slow down the fire rate of a fully auto gun (the fully auto gun was more like a shotgun becuase of the high fire rate and small magazine).

stuff you'll need:

1) alot of K'NEX
2) a computer (to view this page)
3) hands (to put it together)

Step 1: Make the Body of the Gun

Picture of Make the Body of the Gun

Well pretty straight foward, assemble the pieces the way they are in the picture. This part holds the firing mechinism in place.

Step 2: Make the "Barrel"

Picture of Make the "Barrel"

make the pieces and put then together.

Step 3: Make the Firing Mechinism Parts

Picture of Make the Firing Mechinism Parts

once again make what you see in the picture, these are the parts that make the gun fire.

Step 4: Stock (optional)

Picture of Stock (optional)

you dont need this piece but it makes it look cooler

Step 5: Other Parts

Picture of Other Parts

important piece that i can't think of a name for...

Step 6: Add Parts to the Body

Picture of Add Parts to the Body

your almost done!

Step 7: Add Parts to the Body (Part 2)

Picture of Add Parts to the Body (Part 2)

last step!



streach each rubber band from the tip of the barrel to the white pin, only put one rubber band on each white pin. after loaded (doesn't have to be fully loaded, you dont have to put on all 8 rubber bands each time you fire) pull the trigger, theres 8 trigger so you have to move your finger up every shot

how to fire it



Oddball1011 (author)2010-07-30

I'm looking at it on my ipod

matthewb6 (author)Oddball10112010-08-12

I can up that. I'm on my wii. :)

zmxninja (author)matthewb62012-02-13

i can up that; im on my psp

Inventor X (author)zmxninja2012-03-12

I can up that. Im viewing off of a computer running DOS

dragon#1 (author)Inventor X2012-04-09

I can up that, im on my kindle

I can up that I'm on my ipod with pornhub as my search engine

Benjaay999 (author)2014-06-28

good idea for your first try, but not very good looks or performance... :(

benjiman345 (author)2012-08-31

i only had small elastic bands so i put the elastic band through the hole of the yellow connector on the recoil thingy this works so well and it fires single shot

fishbob1234 (author)2012-07-12

thanks for posting- one of my first knex guns. i liked shooting them all of at once

F4T4L1TY (author)2012-05-28

I have three monitors :P Plus laptop with another screen wich makes 5 monitors :P

eLeMeNtLtd. (author)2011-08-22

i dont have number 3 (hands) sorry

JoeyHersh (author)eLeMeNtLtd.2011-10-15

then how did you write: i dont have number 3 (hands) sorry?

eLeMeNtLtd. (author)JoeyHersh2012-01-20

i typed it with my nose.

dragon#1 (author)eLeMeNtLtd.2012-04-09

how do u use the mouse?

JJ8090 (author)eLeMeNtLtd.2012-03-01


zmxninja (author)2012-02-13

bet you didnt know you can fire this automatically!

danroy99 (author)2011-12-23

Hey. Great gun! This was the first gun I ever made. I generally have more fun with it by putting 2 bands in each white notch and then pulling back the recoil thingy to make it work like a rubberband shotgun. :) I also do this because it doesn't always fire correctly when using the trigger...

not so cool (author)2011-10-14

hey i made one and it is really cool but when i put about 4 or 5 bands each white peace on and pull the trigger they all seem to fire. how can i stop this from happening.

Dragonfly7 (author)2011-09-17

i have dual monitors and theyre both macs

knexgunner94 (author)2007-08-16

do you need the pieces fom the solar kit with the tabs on them

zmxninja (author)knexgunner942011-08-11

nah u can just jointhis up with rods, it even says the stock is optional :D hope this helps :)

angry sheep (author)2011-07-21

i have 10 monitors.5 are for my laptop 5 for the one with the tower.(my laptop is connected to the one with the tower)

videogamemaster (author)2011-07-19

No, I don't want dual monitors when one of them is a chunky old CRT (Even though I own one '-.-)

Lol, awesome gun! Scary lookin'. Somebody saw that sucker come out in a K'Nex war they'd forfeit right then and there.

jdttc (author)2011-07-17

i have duel monitors and i love it haha

sniper_lover (author)2011-07-09

srry, but this gun sucks, dont work...

Fred the evil puppet (author)2010-07-27

i have quad monitors so HA!!!

finally, someone else!

i got tripple monitors

poptythai (author)2011-03-10

mine wont fire help

knex13pep (author)2008-07-31

hi its knex1 3pep u no how do u put pichures on this web site i do to upload pichures and upload 1 but it neva works please get back to me my e mail is

man3 (author)knex13pep2011-02-23

never works for me

man3 (author)2011-02-23

dude this gun is amazing!!!!!!!!!!!!!! i just made it and it shot like 50 feet!!!!!!!!!

slimshaddy (author)2011-02-16

i have dual monitors a 23 inch and a 22 inch

naruto the ninja13 (author)2011-01-01

if you load it and oull the recoil part instead of the trigger it works very well as a shot gun

zmxninja (author)2010-06-25

do you have to add the recoil rubber band

dragonwriter7 (author)zmxninja2010-12-29

Absolutely. Without it, the recoil falls and the trigger wheel spins freely. In other words, it won't hold the ammunition, and it no longer works as a trigger.

zmxninja (author)dragonwriter72010-12-31

i didnt have a big 1 so i just use 4 small ones

lasermaster3531 (author)2010-05-17

I built this gun last week. it works pretty well. on a completely unrelated topic, i found this site and it says if people click this link, i get money. click the link!!! you will obey the link!!!

NO! (clicks link) OH MY GOD!!! XP (dies)

Knex Lego Maniac (author)2010-07-21


wtf is wrong with u u said that in many other instructables too ???????????????????????

my bad

he's the epic KILLERK!!! he is almost (almost) as awesome as chuck norris so he can do/say whatever he feels.


hoi (author)2010-10-10

HA you are talking about dual screen, i have triple screen:D

mechaninja (author)hoi2010-12-23

o ya triple screen is freakin hard to configurate i have a 4 screen setup i took the screens out of flatscreen monitors and mounted them on a board then wired them (they are all the same) so that its like having one big screen

harry599 (author)2010-06-18

I have duel monitors, and they are both 19" widescreen LCD's, so ha =]

rookiebuilder (author)harry5992010-12-18

Holy crap!

glugnar (author)harry5992010-07-26

i have a 55" lcd monitor with a dual quad processor so ha ha XD

About This Instructable




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