AR-15 super premium Nickel Boron Bolt Carrier Group BCG (polished finish)

Description

• 2.23/5.56,
• M16 Cut
• Nickel Boron Polished BCG Steel : 8620
• Bolt:  9310
• Extractor: 4140
• Gas Pin Staked
• O-ring: Rubber
• Gas rings: Stainless Steel
• Cam pin: 4140
• Firing pin: 4140