The Radian Weapons Bolt Carrier Group BCG was expertly designed to minimize carrier tilt while also reducing overall friction. These Radian Weapons Bolt Carrier Groups feature a shot peened bolt that meets and exceeds Mil-Spec standards. In addition, the Radian Weapons Black Nitride Bolt Carrier Group BCG has grade 8 hardware that is the pinnacle of performance, reliability, and durability. The Radian Weapons Enhanced AR15/M16 Bolt Carrier Group BCG is sleek, reliable, and durable on and off the range.