UTG New Gen Dovetail to Picatinny/Weaver Rail Adaptor Mount. 3.94 inch Scalloped Picatinny Rail with 9 Slots with a 0.59 inch Saddle Height Provides Ample Space for Snag Free Mounting of Different Sized Optics and Flexible Eye Relief Adjustment. Compatible with Most 9mm - 11mm, Flat or Rounded, Airgun/Shotgun Dovetail Rails. Three High Strength Locking Screws Ensure a Solid Mount-to-Receiver Lock Up. Recoil Resistant Stop Pin Aids in Additional Zero Retention Against Bidirectional Recoil Force Typical of Spring Operated Airguns. Precision Machined from Aircraft Grade Aluminum and Finished in a Matte Black Hard Coat Anodize.