Built for classic military-grade durability, the San Tan Tactical Phosphate 5.56/.223 Bolt Carrier Group delivers proven, battle-tested reliability. Featuring a heavy manganese phosphate outer finish, this BCG holds wet lubrication exceptionally well for consistent cycling under hard use. The carrier bore and key are chrome-lined to resist gas erosion and heat fatigue, making it the ideal choice for shooters who want a rugged, no-nonsense mil-spec assembly built for demanding conditions.

• Traditional Manganese Phosphate Finish for Maximum Oil Retention
• Chrome-lined Interior Carrier Bore and Gas Key
• Precision-machined to Exact Mil-spec Dimensions
• High Corrosion Resistance
• Shot-peened and Magnetic Particle Inspected (MPI) Bolt
• Reliable Drop-in Performance for Standard 5.56/.223 Uppers.

Specifications:
Caliber: 5.56 NATO / .223 Remington / .300 Blackout
Platform: AR-15
Finish: Heavy Manganese Phosphate (Mil-Spec Outer Coating)
Lining: Chrome-Lined Carrier Bore & Gas Key
Carrier Material: 8620 Steel
Bolt Material: Carpenter 158 Steel (Shot-Peened & MPI)
Profile: Full-Auto / M16 Cut