The Leapers UTG Dovetail to Picatinny Weaver Adapter Mount is a 3.94 inch scalloped Picatinny Rail with 9 slots and a 0.59 inch saddle height provides ample space for snag free mounting of different sized optics and flexible eye relief adjustment. It is compatible with most 9mm-11mm, flat or rounded, airgun and shotgun dovetail rails. It features three high strength locking screws to ensurea solid mount-to-receiver lock up. It is machined from aircraft grade aluminum and finshed in a matte black hard coat anodize with recoil resistant stop pins to aid in additional zero retention against bidirectional recoail force typical of spring operated airguns. UTG New Gen Dovetail to Picatinny Weaver Rail Adaptor Mount 3.94 inches Scalloped Picatinny Rail with 9 Slots with a 0.59 inch Saddle Height Provides Ample Space for Snag Free Mounting 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