UTG Leapers MNT-DTW145 Inc, Dovetail to Picatinny Rail Adaptor, Black UTG new Gen dovetail to Picatinny/Weaver cantilever rail adaptor Fits 9mm - 11mm airgun/shotgun dovetail rails 5.7 inch Picatinny top rail with 14 slots to provide flexible Eye relief adjustment and mounting flexibility of various optics