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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.
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.