Autonomous pistol .22

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
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hectmarr
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Sat Aug 22, 2020 12:12 pm

My new self-made short gun. It is a hybrid pistol, with a built-in air pump, that operates with 8x and five strokes only. It shoots common pellets, .22, and the firing barrel is 12 micro-ridged, 200mm long. My friend's chrono gave about 650 fps on 3.5 ml of butane. It weighs about 900 grams, and retention of the mixture under pressure is achieved with my "captive ball" valve, which works like a rupture disc but does not need to be changed every time it is triggered. The change occurs every 150 to 200 shots. This simple valve is adjustable to regulate the pressure at which the steel ball escapes when combustion occurs.
The air pump is 16 mm in diameter and the combustion chamber has about 15 ml of internal volume.
The gas tank is a disposable cigarette lighter, which is housed inside the handle. It is activated by simply pressing for about 2 seconds and the dispenser retains only the amount of gas programmed.
The bolt-action system to load the ammunition is missing, I am building it, and it is attached to the screw gun.
The operation of the weapon is as follows:
1- load the pellet
2- close the check valve,
3- add gas
4- Give 5 pumps
PAB-I, vista general.JPG
PAB-I, Interior.JPG
PAB-I, VISTA INFERIOR.JPG
PAB-I, vista inflador.JPG
PAB-I, vista parte delantera.JPG
PAB-I, vista superior.JPG
sistema bola cautiva.png
sistema bola cautiva.png (6.29 KiB) Viewed 310 times
válvula de bola cautiva.JPG
Ideas don't make holes. The weapons yes! ;)
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Moonbogg
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Sat Aug 22, 2020 7:47 pm

Beautiful work!
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mrfoo
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Sun Aug 23, 2020 4:17 am

Ooooh, I like that. I assume the part that eventually needs replacing is the o-ring?
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hectmarr
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Sun Aug 23, 2020 9:25 am

Thank you moonbogg, mrfoo.
Yes, the gasket needs to be replaced from time to time, it lasts many shots, about 150 at least. Only the firing barrel is unscrewed, simply.
Ideas don't make holes. The weapons yes! ;)
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hectmarr
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Tue Aug 25, 2020 9:53 am

With bolt-on system for loading ammunition, I finished it yesterday ;)
The bolt can be completely removed from the weapon, it is a modular design,
The bolt can be completely removed from the weapon, it is a modular design,
Ideas don't make holes. The weapons yes! ;)
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hectmarr
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Mon Sep 07, 2020 3:02 pm

I got a good price for a silencer that is just right for the barrel thread. The gun was literally silent! 8-) , in good time.
pistola híbrida autónoma 1
pistola híbrida autónoma 1
Ideas don't make holes. The weapons yes! ;)
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