PolyTech USA introduces our NEW SKS 922r Compliant SKS 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. This SKS gas piston from Poly Technologies is a direct replacement for you original piston. Constructed of 416 stainless steel, ensures smooth operation, long life, and easy cleaning. Include this gas piston on your rifle builds as one of your US made parts.