The GB-120 low profile extended nose gas block by Sadlak Industries is designed to fit inside most multi-rail forearms and over barrels with a .750" diameter. The extended nose covers drill hole and unparkerized bands resulting from removal of a standard A2 sight. This carbon steel alloy gas block weighs 1.9 ounces and features a manganese phosphate finish. The two included USA holo-krome point set screws feature a special knurl point that prevents loosening.
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