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Barrel CoatingSalt Bath Nitride Barrel ContourM4 Barrel Length16 Barrel Material4150 Chrome Moly Steel BrandBear Creek Arsenal Caliber Gauge5.56 NATO Feed RampsM4 Gas Seat Diameter.750 Gas System LengthCarbine ManufacturerBear Creek Arsenal PlatformAR-15 Thread Pattern1/2 X 28 Twist Rate1:9 from Primary Arms (Product B556CM41619M)

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