FEATURES-Low profile gas block (steel with set screws)-.750-Black steel-BCM Low Profile Gas Block for AR15, M16, M4, M4A1. Machined of steel, phosphate finish, for .750 barrels.-Manufactured within very tight Mil-Spec tolerances on all ID's.-Barrel ID honed after finish per USGI TDP.-Made by Bravo Company MFG, Inc. with set screw mounting -Set Screws are Steel 10-32 x 3/16 Knurled Cup Point
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