Choosing the right Bolt Carrier Group (BCG) for your AR-15 involves understanding steel types like 8620, Carpenter 158, 9310, and S7, each offering different strength and durability. Coatings such as Phosphate, Nickel Boron (NiB), and Diamond-Like Carbon (DLC) impact friction and maintenance. Critical features include M16 vs. AR-15 profiles, proper gas key staking, and quality control like MPI testing. Enhanced designs with relief cuts and balanced components reduce wear and improve reliability.
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