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SKU: SSO3187
Cmmg's barrel sub-assembly is ideal for building your custom ar-15 upper group.It comes with properly installed m4 barrel extension.Caliber Or Gauge: 223 Remington/5.56 NATOLength: 16.10"Model: Barrel Sub-AssemblyTwist: 1:7"Sights: NoneFinish: Black NitrideType: RifleBarrel Type: MidlengthBarrel Features: Medium Taper Profile