APF Nickel Boron Bolt Carrier Group The APF NiB BCG is machined to mil spec standards

The APF NiB BCG is machined to mil spec standards. BOLT: 9310 material Shot Peened Heat Treated Nickel Boron Plated CARRIER: SAE 8620 Heat Treated Nickel Boron Plated Full Auto EXTRACTOR: CNC machined Shot Peened Heat Treated Nickel Boron Plated FIRING PIN: Swiss machined Heat Treated Precision ground GAS KEY: CNC machined Heat Treated Chrome Lined Torqued and Staked to Carrier Mil Spec. Nickel Boron Plated CAM PIN: Swiss machined Heat Treated Nickel Boron Plated