The RA1011BLK is an advanced bolt-carrier group (BCG) brought to you by Rise Armament. It\'s manufactured with an unwavering commitment to precision and subjected to individual inspections that guarantee superior performance. Each model undergoes individual MPI testing and is crafted from robust tool steel.Exclusively designed to complement your AR-15, this bolt-carrier group boasts a sleek black nitride finish, lending an air of sophistication while ensuring durability. Experience high-quality performance with Rise Armament\'s finely-crafted bolt-carrier group.