This review covers the TR Enabling AR-15 Bolt Carrier Group (BCG) featuring their 'Obsidian' coating. The Obsidian coating is a nickel-based, Teflon-impregnated finish with a low coefficient of friction (0.06) and high Rockwell hardness (70). It offers advantages like reduced staining and a matte finish, making it ideal for those concerned with signature reduction. The BCG is constructed from 8620 steel for the carrier and Carpenter 158 steel for the bolt, both meeting military specifications. The gas key is one-piece billet steel with good staking, and the bolt is MPI and shot peened. The extractor is billet with a full-auto spring buffer and O-ring for positive ejection. The reviewer recommends lubrication and notes the coating's benefits for suppressed shooting.
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