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Phase 5’s Mil-spec M-16 / M4 bolt carrier features a heat treated and chrome lined inner with a black phosphate coating. The complete bolt carrier group includes cam pin, firing pin, gas key, and bolt.

Specifications:

• Caliber: 5.56 NATO / .223 Rem / 300 BLK
• Material: 9310 Steel Bolt
• Finish: Phosphate
• Profile: M-16
• Overall Length:  7.5 inches
• Assembled Weight: 327.4g

HEAT TREATED, CHROME LINED CARRIER AND GAS KEY.