Our Bear Creek Arsenal Barrels are 100% USA Made and are individually inspected to ensure it meets its required specifications. They are manufactured from 4150 Chromoly vanadium steel and finished with a chrom salt bath nitride for extra durability. ALL BCA Barrels are guaranteed a 1.000" MOA at 100 yards with the appropriate ammo and shooting techniques. Length:16" Profile: Contour Twist: 1-8 Finish: Black Nitride Material:4150 Thread Pitch: 1/2 x 28 Caliber: 5.56 NATO Feed Ramp: M4 Flutes: N/A Gas System: Carbine Gas Block System: 0.750 Gas Hole Diameter: 0.072 from Bear Creek Arsenal (Product B556CM41618(M))

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