PolyTech USA introduces our NEW AK47 922r Compliant AK47 Gas Piston. Precision machined at the Poly Technologies facility in Atlanta, GA. Built tough and laser engraved “Poly Technologies and MADE In USA” on the side. Include this gas piston on your MAK 90 conversions as one of your US made parts. Constructed of 416 stainless steel, ensures smooth operation, long life, and easy cleaning.