NcStar Mark III Tactical Scope Adapter with Double Weaver Base/34mm (M2RD34) Dual Weaver style 34mm scope Adapter Allows the shooter to mount two accessories to 34mm tube scope Constructed of high quality anodized aluminum Dual Weaver-style 34mm scope adapter for Mark III tactical scope Lets you mount two accessories, such as red dot sight, laser, or flashlight High-quality anodized-aluminum construction Measures 1.8 inches long; weighs 1 ounce