BCM low profile gas block for AR15, M16, M4, M4A1. Machined of steel, phosphate finish, for .625 inches 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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