ABC RIFLE COMPANY AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly .750 in Gas Block Black Mid Length Black. 750in diameter perfectly suited for most modern AR-15 barrels. Paired with a 416R stainless steel carbine-length gas tube this setup ensures reliable gas flow and long-lasting durability. The black nitride finish enhances corrosion resistance and surface hardness. Two set screws are included for secure barrel attachment making installation quick and hassle-free. Specifications for ABC RIFLE COMPANY AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly: Manufacturer: ABC RIFLE COMPANY Color: Black Gas Block Journal Size-Diameter: .750 in Gun Make: AR Platform Gun Model: AR-10 AR-15 Gun Type: Rifle Package Contents: ABC RIFLE COMPANY AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly What firearm models does the manufacturer say ABC RIFLE COMPANY AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly is compatible with? The manufacturer suggests that ABC RIFLE COMPANY AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly is compatible with AR-15 AR-10ABC RIFLE COMPANY UPK-GTMBGB750: AR-15/AR-10 Low Profile Steel Gas Block Gas Tube Assembly .750 in Gas Block Black Mid Length Black