Brownells Brn-4/Hk416 Compatible Piston Assembly
Brownells Brn-4/Hk416 Compatible Piston Assembly, U.S. made gas piston assembly for the Heckler & Koch 416, 417, MR556, MR762, G28, G36 and SL8 firearms. High quality replacement or build component. Stainless steel piston, includes gas rings. Mfg: Brownells