San Tan Tactical Enhanced AR-15 Bolt Carrier Group – 5.56 NATO, Nitrided Black

The San Tan Tactical Enhanced AR-15 Bolt Carrier Group is a drop-in replacement designed to improve reliability and extend service life in your 5.56 NATO or .223 Wylde AR-15. This BCG features upgraded internal geometry and a properly staked gas key to ensure consistent cycling across a wide range of ammunition and environmental conditions. Ideal for shooters looking to upgrade from a factory BCG or replace worn components with a durable, mil-spec alternative.

Constructed from 8620 steel with a salt bath nitride finish, this BCG offers superior corrosion resistance and reduced friction compared to standard phosphate finishes. The nitriding process hardens the entire surface, not just a coating, which extends wear intervals and simplifies cleaning. This is a drop-in part compatible with mil-spec AR-15 upper receivers—no gunsmithing required. Properly torqued gas key screws and a correctly shaped cam pin ensure reliable lockup and extraction.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, 5.56 NATO, .223 Wylde
• Material: 8620 Steel
• Finish: Salt Bath Nitride (Black)
• Installation: Drop-In
• Includes: Bolt Carrier, Bolt Assembly, Cam Pin, Firing Pin, Retaining Pin