This review of the AIM Surplus Black Nitride AR-15 Bolt Carrier Group highlights its durability, ease of cleaning, and performance. The reviewer, with extensive experience, details the nitriding process, material specifications (9310 steel bolt, 8620 steel carrier, 4140 steel gas key), and compares it to other finishes like phosphate and nickel boron. It's presented as a cost-effective upgrade for AR-15 owners seeking enhanced wear resistance and corrosion protection.
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