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

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