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Gunfire Sound Generator

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Gunfire Sound Generator

Unread postAuthor: Digital941 » Fri Dec 18, 2015 5:16 am

Hi Guys,

I am new to the forums, so hello! I would like to build a Gunfire Generator to sound like an AR15 shot. This is to somehow be mounted to a HPA Airsoft Rifle for Milsim. I don't know if this is possible with compressed air and that I would have better luck with combustion but I have 2 HPA (3000psi) tanks so HPA is convenient.

The only limitations I have is that it needs to be as small as possible, very air efficient and only run on 1 tank at a time, simultaneously with my HPA at 6bar. My regulator gives off 6bar which most likely is not enough for what I want, so reluctantly I may be able to duel reg and split the line after the first one at ~27bar.

Any help will be appreciated! Thanks! :)
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Re: Gunfire Sound Generator

Unread postAuthor: mark.f » Fri Dec 18, 2015 11:01 am

I can tell you that an AR-15 is extremely loud, especially next to structures. Trying to duplicate it exactly with HPA or a flammable gas isn't going to end spectacularly.

However, the guidelines here would be: a fast-acting valve if pneumatic, burst disks or a fast acting valve triggered by pressure if combustion, high flow, a short or non-existent "barrel", and high pressures. Also, the cross-sectional area and flow of the "valve" play a large factor as well.
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Re: Gunfire Sound Generator

Unread postAuthor: Digital941 » Fri Dec 18, 2015 11:09 am

Thanks for taking a look; this is what I saw recently: https://youtu.be/NvoxvAHGZec?t=1m18s
It uses propane ignition, I have a propane canister and supply, but I thought compressed air may be a little safer as you don't want a spark anywhere near the reservoir...
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Re: Gunfire Sound Generator

Unread postAuthor: mark.f » Fri Dec 18, 2015 5:05 pm

Yup, not much information, but from what I can see it's posing as a 203 (large cross sectional area) and has a plug which moves forward when firing (pressure-actuated valve). That's just what I think I can tell from the video though.
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Re: Gunfire Sound Generator

Unread postAuthor: jackssmirkingrevenge » Wed Dec 23, 2015 6:56 pm

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Re: Gunfire Sound Generator

Unread postAuthor: AlfiePB IanB » Sat Jan 30, 2016 12:07 pm

Pulsing a 1/2 or 3/4 inch solenoid (can't remember size) with nothing attached to it and 60bar makes quite a bang, doubt it sounds like an AR15 but if you aren't expecting it it will make you jump.
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