Full Auto Knex Gun

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Introduction: Full Auto Knex Gun

About: Knex builder here at Instructables. I build Guns, and, Roller Coaster. I currently build about 2-3 guns a month. I strive to post quality as well as quantity. If you have any ideas for a gun for me to try ou...

So i was looking at myomys full auto theory and thought, he is making this way to complicated. So I added a few changes and used a simple trigger to make the first fully functioning full auto knex gun. It shoots 9 shoots in less than a second but when put in slow mo one my phone, you can see each individual shot being fired. With a little help from the dunkis I declare this the first functioning full auto knex gun. I realize that knexguy123456 or what ever his name is made a full auto knex gun, but his could only hold 2 which doesn't really count IMO. So let's talk about stats.

Pros
Full auto
Looks ok
9 shot
Complicated mech
Jams very little
High rof
Cons
The rof is so fast that the whole controllable part is useless since it fires so fast but nevertheless is controllable.
Long reload times (about a min)

Firing demo -https://youtu.be/44q76Wc44Mw

Over view of gun- https://youtu.be/6KNPKUGJhCs

So I hope you guys enjoy my first innovative knex gun.

Credits
Blue mullet - trigger mech off his blowback rifle
The dunkis- helping me figure this thing out
Myomy- for being the first to make a similar mech

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    30 Discussions

    Well Building a full auto knex gun with no broken pieces would be extremely hard. it wasn't easy building one with tons of broken pieces lol. Thanks though, means a lot getting a comment from you.

    This is a great implementation of the idea, I remember Dunkis talking about this waaayyyy back but no-one seemed to make it work. To decrease the fire rate, use a small tire on on the same shaft as the band cog to induce a bit of friction on it. Should slow things right down. Also make a brake shoe with an adjustable grip force to push against the tire, to vary the force rate as needed.

    2 replies

    Thanks! I wish I would have thought of that tire idea when I still had this gun. I'm planning on rebuilding this again in the future and try and get this working a little better. Question, you still building with knex?

    Ok, could you reply your
    Phone number on G+ so I can add you as a contact

    You could maybe use whatsapp or facebook messenger, or something like that, as both should be free, when using wi-fi.

    Oh crap, I don't have skype and my mom want let me get it. Can we just text pics of the gun?

    No :( I had to take it off since there was less room after I changed the mech and plus it fired to quickly for the mag to reset itself.

    I might do it, I've got a lot on my plate right now but when I start getting through with request and collaborations I'll get right to it.

    FaceTime, do you need my phone number or email? I'll pm you it on G+

    not entirely full auto, just lets out all of the lastics at once, more like a shotgun.

    Still, good job

    1 reply

    Not all at once, I've slowed it down so there is a noticeable difference in each shot. I think I've slowed it down enough to possibly put a mag, but the problem Is where do I put a mag since I put the lever closer to the front of the gun. But thanks!

    Schools out for me so I'm free whenever, I guess we are gonna do that war gun I told you about. Your gonna have to teach me about handle pumps though because I've never built one.