Homemade Gas Powered Machine Gun

This video shows an impressive homemade CO2 powered fully automatic air gun. The magazine holds 23 AA batteries and it can fire them at a rate of 600 / minute. It is impressive how well it cycles.

The inventor wrote on YouTube …

When the gun is fired, the bolt blows forward and clears a plug allowing air to flow though it in to the barrel.

Cost to build the bolt & barrel (excluding tools): $10 and i still have enough pipe to make 3 more.

Estimated cost to build the rest of the gun: $30 (would be cheaper if i used all PVC)

Estimated cost to build the magazine: $10 + scrap sheets of 80 mil high-density polyethylene geomembrane

The PVC i am using is rated at more than 2x the pressures i am using it for.

I do have a smaller full metal tank that i will be testing with shortly – a smaller tank will increase the ROF but will decrease its power.

[Hat Tip: Hack A Day]

[ Many thanks to Victor for emailing me the link. ]



Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


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  • Lance

    High powered airsoft LOL

  • Pretty interesting. Next comes a D cell version.

    • roger

      A nerd and his nerd gun. I have real firearms . Not toys and video games. Why is this on a Firearms Blog?

      • Vinnie

        And a hater has to hate.

      • Erik

        Hater.

        This thing is rad. Imagine what this “nerd” could do with access to a real design suite for real firearms.

        I applaud his creativity.

      • Frodo

        Lets see you do better.
        Props to this guys creativity.

  • To make an open bolt SMG is much more simple than this piece. (F… OFF BATFE.)

  • roger

    I did not even mention hate? Read it. This is not a firearm. I have many real firearms.
    Next a review on making a a patato gun/cannon!!!
    http://dangerouslyfun.com/spud-gun
    Nurfguns too!! and How to modify the nerf guns.
    http://www.instructables.com/id/Nerf-Gun-Modifications./

    Have fun kids.

  • roger

    I did not even mention hate? Read it. This is not a firearm. I have many real firearms.
    Next a review on making a a patato gun/cannon!!!
    http://dangerouslyfun.com/spud-gun
    Nurfguns too!! and How to modify the nerf guns.
    http://www.instructables.com/id/Nerf-Gun-Modifications./

    Have fun kids

    • james

      it’s not a firearm and the engineering that is demonstrated is not new, but what is new is the use of simple items to create it.. and the ingenuity that created it.. which i’m all for..

  • Love it. Looks like if he made the air chamber slightly shorter he could attach the mag on the bottom.

  • West

    Pretty freakin’ sweet.
    Imagine what this guy could do in a real shop with access to design tools and computers.
    And, of course, haters gonna’ hate.

  • Victor

    Zip ties and everything……. huge props for creativity and a great “make-do” approach!

  • mike

    I love how happy he is when it works.

  • Joe

    This is totally cool.

    We got our guns and these nerds define individuality by making awesome air powered fullauto stuff.

    Give this guy a cnc machine, lathe, computer, ect, he’ll come up with some crazy Timecop, Judge Dread, Alien M40A1 type rifle.

  • DaveR

    Gives “batteries sold separately” a whole new meaning 😉

    Bravo!

  • Trae

    Obviously whoever wrote this post doesn’t know a lot about compressed gas’s. this gun isnt co2 powered… its powered by compressed air. you can even hear the air compressor kick on… It could be operated off co2… But in this video its not..

  • clayton

    clip…..that drives me nuts.

  • A2

    I liked this video and I liked the kid in it.
    He’s got spirit.

  • Nicks87

    Someone already came up with this idea, it’s called a paint-ball gun.

    Same concept, right? Compressed air pushing a projectile.

    And a paintball gun doesnt have to attched to a compressor.

  • Zermoid

    At last, a good use for dead AA batterys!

    Not sure why the ‘clip’ is so honking huge but otherwise looks like fun. Wonder how long a CO2 cylinder would last on that thing?