Leapers MNT-DTW145 UTG Universal Dovetail to Picatinny Weaver Cantilever Rail Adaptor Fits 9mm-11mm .22 rifles Airguns and Shotgun Dovetail Rails. This dovetail to weaver picatinny rail adaptor is 5.7" long Picatinny Top Rail with 14 Slots to Provide Flexible Eye Relief Adjustment and Mounting Flexibility of Various Optics. Easily Slides On and Universally Fits Both Flat & Rounded Dovetail Receivers. Precision Machined from Aircraft Aluminum and Finished with a Matte Black Hard Coat Anodized. Comes with 4 High Strength Screws and Adjustable Recoil Resistant Stop Pins Which Ensures Solid Locking and Zero Holding and is Designed to Resist Bidirectional Recoil Force.