Stern Defense 004SDBU9D1M 9mm Mag Phosphate AR15/M16 Bolt Carrier Group

The Stern Defense 004SDBU9D1M is a 9mm bolt carrier group designed for AR15 and M16 platforms, made from 8620 steel with a manganese phosphate finish. This component is built to provide dependable operation and is suitable for a range of pistol caliber carbine configurations. - Precision-machined 8620 steel with phosphate finish - Compatible with Glock-pattern and Colt SMG magazines - Fully assembled and ready for installation The Stern Defense 9mm bolt carrier group delivers reliability and magazine versatility for your AR-pattern build. It arrives complete, requiring no additional assembly before use.