Homemade 400 Psi Airgun

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Introduction: Homemade 400 Psi Airgun

15.5 mm Bore, 1:30 helical cut rifling, aluminum, brass and stainless construction.. Calculated at mach 1.2 with hydrogen at 400 psi. Main ammunition are marbles..

Barrel: 15.5mm x 1.2m, 1:30 rifling (ammo; wadded marbles)
Chamber: 15.5mm x 80cm
Operating pressure: 120-400 psi
Blowgun porting, male QD for filling, with a built in internal check valve
Semi-bullpup configuration

I made a hand pump for it, which will easily reach 400+ psi, but takes far too long to bring the gun to pressure. So I'm going to buy a 260 psi track pump and use that..

Any questions? By the way I'm going to make a nice handle for it..

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18 Comments

Nice! I am building one with a QEV valve too. My tank is a bit bigger because it is 1 1/2 inch steel pipe.

Using such high pressure with a QEV will break it.

Aaaaaaaawwwwwwweeeeesssssssoooooooommmmmmeeeeeeeeeee!!!!

how did you get 400 psi with a hand pump?

can i use galvanised steel?

um don't you think that is a little dangerous!

um don't you think that is a little dangerous!

 hand pump????? more info PLEASE and how did you  rifle your pipe

oh, and dogzinhood, the trigger is a blowgun, you can find it at your local lowes of harbor freight (local hardware store)