Luth-AR AR-10 Bolt Carrier Group Features The Luth-ar Bolt Carrier Group is machined from 4140 chromoly steel and built as a direct drop-in part for AR-10 pattern rifles chambered in .308 / 7.62mm. The bore is chrome lined for smoother cycling and easier cleaning after extended range sessions. The .308 bolt comes with its extractor already installed saving the builder a step during assembly or a swap. A manganese phosphate finish protects the steel components from corrosion and wear during regular use. The carrier key is chrome lined to resist carbon buildup and is secured with two included bolt carrier key screws for a reliable gas seal. A firing pin cam pin and chrome firing pin retaining pin are all included giving the builder every part needed to complete the swap without hunting down additional components. This drop-in design keeps installation simple for both first time builders and experienced armorers. The Luth-ar Bolt Carrier Group is available for sale at GrabAGun for anyone building or maintaining an AR-10 platform rifle. Luth-AR AR-10 Bolt Carrier Group Specifications Manufacturer: Luth-AR Model: Bolt Carrier Group Caliber: .308 / 7.62 X 51 Color: Black Material: 4140 Chromoly Steel Compatible Hosts: AR-10 Finish: Manganese Phosphate Style: Drop-In Available At: GrabAGun