The LANTAC Low Profile Gas Block is manufactured to the highest quality standards. Designed to fit .750 diameter gas pad barrels and uses a 2 set screw design to securely retain the block in position. Comes complete with #10-32 X .125" set screws and gas tube roll pin. Places the gas port hole at the correct .295" position from the shoulder. FeaturesLow-profile design4140 Gun Barrel SteelBlack Phosphate Finished, Type MLaser Engraved