Dovetail to Picatinny rail adapter with two inches of forward extension for firearms equipped with 11mm or 3/8 inch dovetail standard. The dovetail base measures 3 inches in length while the top rail measures 5.5 inches (14 total picatinny slots). The rail extends an extra 2 inches over the front of the base, allowing for more forward positioning of long eye relief optics. Compatible with dovetail bases typically found on airguns or certain model .22 rimfire rifles. Picatinny rail allows for the mounting of Picatinny or Weaver standard scopes, red dots, or optics. Machined from 6061 grade aluminum and uses hardened steel Torx mounting hardware to prevent stripping of the bolts. All Monstrum mount and accessory products come with a lifetime warranty.