Bear Creek Arsenal BC-15 5.56 NATO 7.5in Upper Receiver M4 Barrel Pistol Length 1-7 Twist 1/2x28 Flash Hider Black Nitride

Bear Creek Arsenal BC-15 5.56 NATO 7.5in Upper Receiver M4 Barrel Pistol Length 1-7 Twist 1/2x28 Flash Hider Black Nitride. 5'' M4 contour barrel profile made of 4150 steel with a black nitride finish. It has a 1:7 twist rate and is chambered in 5.56 NATO. Finished Barrels go through a 100percent Inspection Process. Inspections Equipment includes CMMs and Air Gauges for the Bores. Specifications for Bear Creek Arsenal BC-15 5.56 NATO 7.5in Upper Receiver: Manufacturer: Bear Creek Arsenal Caliber: 5.56x45mm NATO Barrel Length: 7.5 in Barrel Profile: Heavy Gas System Length: Pistol Length Barrel Twist Rate: 1-7 Threads per Inch: 1/2x28 Muzzle Device: Flash Hider Finish: Black Nitride Color: Black Gun Model: AR-15 Gun Rail: M-LOK Gun Make: AR Platform Weight: 1.5 lb Flutes: No Package Contents: Bear Creek Arsenal BC-15 5.56 NATO 7.5in Upper Receiver Bear Creek Arsenal 1209-B556PM47.517M: BC-15 5.56 NATO 7.5in Upper Receiver M4 Barrel Pistol Length 1-7 Twist 1/2x28 Flash Hider Black Nitride