Product Description
Product Features & Specifications Stern Defense 004SDBU9D1M 9mm Mag Phosphate 8620 Steel AR15/M16 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 compatib