FIRE WOLF Barrel Mount 1'' 25.4mm/30mm Ring 20mm Weaver Picatinny Rail Adapter for Rifle Scope Lets you mount such accessories as red dot sight, laser, or flashlight Standard with four sided hexbolts for maximum hold under extreme conditions and automatic weapons fire Single Weaver style 30mm to 25.4mm scope adapter weighs 0.7 ounces,Measures 1.8 inches long