Ade Advanced Optics 30mm Scope Ring Adapter with Picatinny/wseaver/universal Rail 30 mm Adaptor Precision Machined Out of Premium 6061 Aircraft Aluminum Single Weaver-style 30mm scope adapter Lets you mount such accessories as red dot sight, laser, or flashlight Measures 1.77 inches long; Weighs 0.7 ounces Standard with four sided hexbolts for maximum hold under extreme conditions and automatic weapons fire