GM Bolt carrier groups come MPI inspected. Perfect for your next 7.62x39 AR-15 build.7.62x39 is a classic round that is still widely used today by both military and civilians. This caliber is used in some of the most well known platforms around the world such as the SKS and the AK-47. In more recent years the AR-15 platform has adopted this round as well. It's a hard hitting round that can also reach out to some decent distances accurately when using high quality ammunition.
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