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
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