UTG Universal Dovetail to Picatinny/Weaver Adaptor New generation cantilever design rail adaptor Universal fit for both flat and rounded dovetail receivers Fits 11mm airgun/shotgun dovetail rails (will not fit rails smaller than 11mm) Extended 5.71' picatinny top rail with 14 slots provides flexible eye relief adjustment and mounting flexibility for various optics Equipped with 4 high strength screws and adjustable recoil resistant stop pins to ensure solid locking and zero holding Designed to resist bidirectional recoil force Quick and easy slide-on installation Precision machined from aircraft aluminum Hard coat anodized matte black finish Saddle height is minimal 0.59' Weight: 2.4 oz. Width: 0.84 in. This patent-pending UTG Universal Adaptor is exactly what you need. Turn your flat or rounded dovetail receiver into a convenient scope platform. The base is constructed of lightweight, aircraft-grade aluminum so it doesn't add weight to your gun, and is strong enough to withstand serious recoil. Having 14 slots gives you plenty of space to mount the optic of your choice and allows for exactly the eye relief you want.  .