Home / AR Parts / Upper Parts / Bolt Carrier Groups and Parts / AR Bolt Carrier Group, Complete (Nickel Boron) AR Bolt Carrier Group, Complete (Nickel Boron)MSRP $169.99 M16 Complete Bolt Carrier Group – Nickel Boron Bolt Material 9310 Tool Steel Carrier 8620 Steel Staked Gas Key NiB Coated Includes Firing Pin, Retaining Pin, Cam Pin, Extractor, Bolt Gas Rings MADE IN THE USA Out of stock UPC: 784682014578 Category: Bolt Carrier Groups and Parts Product ID: 736