AR-15 Full-Auto BCG – Mercury Gray

The Trinity Triggers AR-15 Full-Auto Bolt Carrier Group – Mercury Gray is built for reliable performance across .223 Remington, 5.56 NATO, and .300 Blackout platforms. Featuring a full-auto M16 carrier profile, Mil-Spec materials, and advanced low-friction surface treatment, this BCG delivers smooth cycling, reduced fouling, and long-term durability. Each unit is HPT and MPI inspected for dependable operation. 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.