LANTAC(TM) USA ULTRA LOW PROFILE GAS BLOCKa Made of 4140 gun barrel steel w/Type M black phosphate finish & laser engraved LANTAC logo a Fits .750 diameter gas pad barrels a 2-set screw design securely retains the block in position a Places the gas port hole at the correct .295 position from the shoulder a Includes #10-32 x .125 set screws & gas tube roll pin a OAL: 0.875 a Wt.: 1.2 oz. a Made in the USA