SNIPER&reg; Dovetail to Weaver Adapter, Rail Base Mount adjuster, 9 Slots Sniper Rail Adapter From Dovetail .22 to Picatinny Rail CNC Machined from Single-Piece Aircraft-Grade Aluminum Alloy with Black Matte Finish Perfect for Upgrading your 3/8" Dovetail Rail Mount to Picatinny Comes Complete with Stop Pin, screws and Hex Wrench