A high quality bolt carrier group is essential to your .308 build. Don't settle for a lesser product. This Spike's Tactical complete DPMS style bolt carrier group has been magnetic particle inspected and high pressure tested. The carrier is made from 8620 tool steel while the bolt is crafted from 9310 tool steel. The gas key has been properly staked and all surfaces are nickel boron coated. Assembled BCG weighs 1 lb 2.8 oz. Note: Current batch does not have the Spike's Tactical logo engraving Includes: Firing pin with hard chrome finish. Cam pin nickel boron finish. Retaining pin.