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From singles it is easily converted
Enough even pneumatic, if under construction (you need to reduce the hanging), but maybe pm will withstand.
But the barrel and shutter need to be cut out of normal steel! Don't fuck with the size and the obturation, or even the SHP will break.
Me and the boys sometimes play airball, I can advise for-gun.ru. You can order delivery to the left name.
They also have SKP and any "interesting" things, but for "their own" and according to the fucking rules.