Fully Automatic Knex Gun !! ( It Really Works )

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Introduction: Fully Automatic Knex Gun !! ( It Really Works )

About: hello everybody plz take a look to my instructables and tell me what you think from them.

Hey guys
this is my fully automatic knex gun it shoots about 15 feet and it is really fully automatic !!


Step 1: The Trigger

make 2 of this

Step 2: The Pushpin

this is the push pin

1) make what you see
2)add them together with a white rod (metalic)
3) make wath you see
4) add 2 and 3 together

Step 3: The Magazine

this is the magazine
( this is not such a good one, so if you can make a better one plz tell me )


1) make what you see
2) add them together with a white connector (black)
3) make what you see
4) make this 2 times
5) make this 2 times
6) add 4
7) add 5

Step 4: Body

1) make this ( left side )
2) make this ( right side )
3) close up from 2
4) make what you see
5) make what you see


Step 5: Inside the Body

this is inside the body the next step is outside the body

1) close up
2) add everything together
3) close up of the 'trigger'
4) close up of the pushpin
5) close up of the magazine
6) ...


Step 6: Outside the Body

this is the outside of the body

1) make this
2) add it to the body
3) add themotor
4) close up
5) close up
6) add 7 little gears at the bottom

Step 7: Magazine Pusher

this is not necessary but you can make it if you want

1) make this
2) add yellow rods (gray)


Step 8: The Rubber Bands

add rubber bands like in the picture

Step 9: Extra Pictures

Step 10: Movie

the firs one fires slow
the second one fires fast

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    55 Comments

    :D I tried this awhile ago. *high five* for perfecting it

    I am making something similar to this but with a different mech... Your clip looks like it works better than any I have built for white rods so, if you don't mind, I'll borrow it.

    2 replies

    sure bro, no problem :)

    It worked a lot better! I just didn't use the clip pusher thing. I made a hinged lid to it.

    make a bigger mag, then make it handheld, then it will be too good and can you make a version without the big wheel and the massive motor. i have the red box connected to the motor ,and the grey ones. so plzzz plzzz make.

    5 replies

    instead of the big wheel you can also use the smaler wheel and a normal wheel 2 times,, the mag is pretty easy to mod, just make a copple of mags and put them on top of each other :p

    im gunna use a small wheel and make it a bit smaller, thanks.

    cool, the wheel is used for making the motor slower and much stronger so if you use just one small wheel it will probably not be strong enough. but you can always give it a try, this is just a concept for an automatic firing mechanism so go ahead and make it better !

    yeh thanks for the reply i might make and i can make it a bit smaller, thats really inspired me.

    thanks man im glad i subscribed your really helpful

    BEAST!!!! man!! maybe you could mod it to make the base stabler?

    you have to connect them with the y-connectores, be sure they are all on the right place :p

    i tryed that....the y connector on the right(pic 5) goes in but the other doesnt

    Sorry man but i really cant see your problem. i could try to solve it if you post a picture...

    qu'est ce-qui ne mache pas ?

    can you do it without that big gear because i dont have one of them??

    1 reply

    I'am sorry for reacting so late but I was at vacation and was not able to go on the internet for 2 weeks :p the big gear is used for slowing down the motor and giving it more power,, if you switch the two gears your motor will be a lot faster but have less power :D you can do it with a small gear and an average gear but the motor will probably be to fast and will not have enough power but if you repeat that i think it will work so i mean - small gear -> bigger gear + small gear -> bigger gear