AR-15 Full-Auto BCG – Obsidian Black

The Trinity Triggers AR-15 Full-Auto Bolt Carrier Group – Obsidian Black delivers duty-grade reliability for .223, 5.56, and .300 Blackout rifles. Built with a full-auto M16 carrier profile, chrome-lined internals, and a low-friction coating, this BCG ensures smoother operation, easier cleaning, and consistent performance. HPT and MPI tested. A high-quality AR-15 bolt carrier group is critical for reliability and performance. Trinity Triggers BCGs are designed with a full-auto M16 profile for smoother cycling and improved function across a wide range of ammunition types. Chrome-lined internals and advanced coatings reduce friction and carbon buildup, making maintenance easier while extending service life.