Product Name: Hunting Accessories Low Profile Steel Gas Block Fit Ar 0.75 Inch Barrel Mount Rifle Gun Gas Tube Model NO.: LQBJ004 Type: Hunting Gun Accessories Material: metal Waterproof: Waterproof Folded: Unfolded Trademark: OEM Transport Package: Gift Box Specification: . 750/. 223 Origin: China HS Code: 7302100000 Product Description Low Profile Steel Gas Block fit AR 0.75 inch Barrel Mount Gas TubeOverview:Hard coat type 3 milspec anodized finish, solid precision machined construction. This AR 223 Micro Gas Block for barrels .750 is used when installing a rifle length quadrail to allow the quadrail to slide through the barrel. The gas tube mounts to the micro gas block just like it would to your regular A2 post gas block, but it is sleek and small to allow a longer rail to be placed.FeaturesWeight: 1.8 ozDiameter: .750/.223Hard coat type 3 milspec anodized finishButtom has 3 screws !!