Product Description Caliber: 6.8SPC II Bolt Steel: 9310 Finish: Nitride Carrier: 8620 Steel Gas Key: Nitride Treated & Properly Staked with Grade 8 Fasteners ToolCraft 6.8 SPC Nitride Bolt Carrier Group - 5165449858 at Palmetto State Armory $159.99 Buy Now Check Price on Amazon Check Price on eBay