As a military contractor, Toolcraft is relied upon for the high quality and durability of its BCGs. All Toolcraft AR bolt carriers meet military specifications and are plated in either black nitride or nickel boron finishes to complete your AR build. All Toolcraft BCGs are shot-peened and MPI-tested for quality and reliability. Made from high-quality steel, bolt carrier groups from Toolcraft are guaranteed to perform like new after thousands upon thousands of fired rounds. Shop our Toolcraft selection today and save big off the manufacturer price!