Stern Defense Melonite .40S&W Complete Bolt Carrier Group - SD BU40

Made with 8620 AISI steel and boasting a Mag-Phosphate finish, the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers. It functions with Colt SMG, Glock magazines and it's fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed, including firing pin/spring/retaining pin, extractor, and extractor spring. Also included in bolt assembly is a propriety center and roll pins.Features:Made in U.S.A.Constructed from 8620 AISI steelCustom 4140 billet extractor providing superior ejection