Bootleg Inc AR-15 Low Profile Gas Block 750 Dia SBN Coating Logo Lasered Retail Packaging Black. These AR Gas Blocks from the innovators at Bootleg Inc feature .4140 steel construction for added durability and stability. With a salt bath nitriding coating the Bootleg Inc Low Profile Gas Block keeps your AR platform running flawlessly. With excellt heat and corrosion resistance this accessory reduces glare. Get a slim trim and modern sporting rifle profile with the Bootleg Inc 750 Diameter Gas Block. Specifications for Bootleg Inc AR-15 Low Profile Gas Block: Manufacturer: Bootleg Inc Color: Black Coating: SBN Fabric/Material: 4041 Steel Gun Make: AR Platform Gun Model: AR-15 Weight: 5 lb Finish: SBN Features of Bootleg Inc AR-15 Low Profile Gas Block Made from .4140 steel for durability Salt Bath Nitriding (SBN) coating for uniform protection Package Contents: Bootleg Inc AR-15 Low Profile Gas Block What firearm models does the manufacturer say Bootleg Inc AR-15 Low Profile Gas Block is compatible with? The manufacturer suggests that Bootleg Inc AR-15 Low Profile Gas Block is compatible with AR-15Bootleg Inc BP-AGB: AR-15 Low Profile Gas Block 750 Dia SBN Coating Logo Lasered Retail Packaging Black