Cmmg's barrel sub-assembly is ideal for building your custom ar-15 upper group.It comes with properly installed m4 barrel extension.The barrel is constructed of 4140 chrome moly with a slat bath nitride finish and 5/8x24" threads.
Caliber Or Gauge: 300 AAC Blackout/Whisper (7.62x35mm) Length: 16.10" Model: Barrel Sub-Assembly Twist: 1:7" Sights: None Finish: Black Nitride Type: Rifle Barrel Type: Carbine Length Barrel Features: Multi Role Profile
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