New product by Red Star Arms. U.S. made gas piston for the AK-47 and MAK90 that will keep your rifle in compliance with section 922 (r). This gas piston is 100% CNC machined, and made from heat treated stainless steel with several improvements. The RSA piston has more cleaning grooves, increased radius of the shaft diameter for reduced flexing, and improved piston cup for a better gas seal and improved reliability.
Note. Does not fit the Hungarian FEG SA85M