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.
This review covers the AIM Surplus Nickel Boron (NiB) coated AR-15 Bolt Carrier Group (BCG). The reviewer highlights the benefits of NiB coatings, including increased lubricity, improved reliability with reduced lubrication, and ease of cleaning. Key specifications discussed include the 8620 tool steel full-auto profile carrier with angle cuts for debris management, and the 9310 steel MPI-tested bolt. The review notes the presence of tool marks on the interior of the carrier, explaining this is typical for NiB coatings. Reliability and headspace were confirmed to be positive. The BCG is priced at $129 and comes with a lifetime warranty.
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