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The carrier comes with a black topcoat/exterior with FailZero EXO Nickel Boron underneath. We've introduced this carrier to provide non-reflective properties, resulting in a Tactical Advantage. This Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15's. Nickel Boron treated parts include: Bolt & Extractor (5.56/.223 compatible) Bolt Carrier Extractor Cam Pin Carrier Key Firing Pin
BCA Barrels are manufactured from two types of steel. 4150 Gun Quality Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved. 416 Stainless Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved. They are Drilled, Reamed, Rifled, Turned, and if Applicable, fluted on CNC Machines. All of these machines are located at 310 McNeill Road, Sanford, NC. All of the machining of the Barrels is completed by BCA. All our Finished Barrels go through a 100% Inspection Process. SKU B300PHB10.517(P) Free Shipping No Length 10.5 Profile Heavy Barrel Twist 1-7 Finish Parkerized Material 4150 Thread Pitch 5/8 x 24 Caliber .300 Blackout Feed Ramp M4 Flutes N/A Gas System Pistol Gas Block System 0.750 Gas Hole Diameter 0.093