Discover the LanTac USA LLC M-SPEC 556 Milspec BCG, engineered for reliability and precision in the AR15 platform. This bolt carrier group strikes the perfect balance between military specification performance and affordability.Designed for serious users, the M-SPEC series incorporates strictly adhered dimensions, tolerances, and upgraded materials for enhanced functionality without breaking the bank. Enjoy peace of mind with a product that meets and exceeds milspec standards.8620 Carrier, Heat Treated, Hard Turned & GroundMPI Carpenter 158 or 9310 Bolt, Shot Peened, Hard Turned/GroundLifetime WarrantyMade in the USAExperience unmatched quality and performance with the M-SPEC BCG, backed by a lifetime warranty.