WMD Guns Bolt Carrier Group Features The WMD Guns Bolt Carrier Group for the AR platform in .450 Bushmaster starts with a case-hardened 9310 steel bolt a material chosen over standard carpenter steel for its added strength and resistance to wear under repeated cycling. The firing pin is hardened heat-treated and chromed giving it a slick corrosion-resistant surface that keeps striking reliably through high round counts. A NiB-X coated cam pin reduces friction at a key wear point in the action which helps the whole carrier group cycle more smoothly over time. This BCG is rated for full-auto use reflecting the level of durability built into every component. The exterior of the carrier itself is finished in nickel boron a coating known for its low coefficient of friction and strong resistance to corrosion compared to a standard phosphate finish. That combination of coatings across the bolt firing pin cam pin and carrier gives the whole assembly a consistent low-maintenance running surface that holds up to repeated use and simplifies cleaning. Equipping an AR chambered in .450 Bushmaster with a nickel boron BCG from WMD Guns gives shooters a drop-in upgrade built specifically for reliability in demanding conditions. The WMD Guns Bolt Carrier Group is available for sale at GrabAGun for AR builders who want proven high-performance internals. WMD Guns Bolt Carrier Group Specifications Manufacturer: WMD Guns Model: Bolt Carrier Group Type: Bolt Carrier Group Color: Nickel Finish: Nickel Boron Compatible Hosts: AR Platform .450 Bushmaster Available At: GrabAGun