Aero Precision AR-15 5.56 Bolt Carrier Group with 9310 Bolt – Black Nitride

The Aero Precision AR-15 5.56 Bolt Carrier Group delivers reliable cycling and extraction for standard AR-15 and M16 rifles. Built with a 9310 steel bolt and black nitride finish throughout, this BCG provides enhanced surface hardness and corrosion resistance compared to phosphate coatings. It's a direct replacement for mil-spec bolt carrier groups and suits shooters looking for a dependable, properly staked component at a competitive price point.

The 9310 steel bolt offers improved strength over standard Carpenter 158 steel, while the black nitride treatment penetrates the metal surface for lasting protection against wear and fouling. The carrier is properly staked and gas key is secured to mil-spec standards. This is a drop-in component for any mil-spec AR-15 upper receiver—no fitting or gunsmithing required. Includes bolt, carrier, cam pin, and firing pin.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, M16 (5.56 NATO / .223 Remington chamberings)
• Material: 9310 Steel Bolt, 8620 Steel Carrier
• Finish: Black Nitride
• Installation: Drop-In
• Includes: Bolt, Carrier, Cam Pin, Firing Pin