The Monstrum Rail Mount for Marlin 336/1894/1895 series rifles is a dedicated optic mounting platform allows for precision mounting of your preferred optic. The Picatinny rail section installs directly to the factory mounting holes in the Marlin via the included set screws. The rail sections are compatible with both Picatinny and Weaver based rings and optics. 4.5 inches or 11 rail slots in length, the rail allows for flexible placement of your optic for optimum eye relief and cheek weld. Crafted from lightweight 6061 grade aluminum. All Monstrum optics mounting products come with a lifetime guarantee.