Noveske Bolt Carrier Group Features The Noveske Bolt Carrier Group is constructed from SAE 9310 steel a material chosen for its strength and resistance to fatigue under repeated high pressure cycling. The DLC coating applied to Noveske s own specification adds exceptional surface hardness while also improving lubricity which keeps the action running smoother with less friction over time. Improved bolt geometry is engineered to provide smoother locking into the barrel extension reducing wear on both the bolt lugs and the extension itself. Machined to USGI specifications the carrier is built to fit standard AR-15 pattern lowers and uppers without modification. Finished in black the DLC coated exterior resists corrosion and handles the heat and carbon buildup that comes with extended shooting sessions. The group includes a Mil-Spec gas key that is chrome lined and heat treated per GI specifications ensuring consistent gas sealing shot after shot. Built specifically around the 6mm ARC cartridge the bolt is matched to the chambering s unique pressures and bolt face dimensions. Builders assembling a dedicated 6mm ARC upper will get a carrier group designed from the ground up for that cartridge rather than a generic 5.56 carrier. Noveske Bolt Carrier Group Specifications Manufacturer: Noveske Model: Bolt Carrier Group Compatible Hosts: AR-15 Caliber: 6mm ARC Material: SAE 9310 Steel Finish: DLC Coated Color: Black Available At: GrabAGun