The XS Lever Rail allows the Marlin 336 and 308MX to mount an optic in multiple positions. This lightweight, anodized aluminum rail is machined to Picatinny specs and allows scope mounting directly over the receiver, or forward for scout scope and red dots. Installation requires removal of the factory rear sight. Fits Marlin 336 with round barrel. All screws torque to 20 inch-pounds.Features:Lightweight, anodized aluminum rail;Machined to Picatinny specs;Allows scope mounting directly over the receiver, or forward for scout scope or red dots;Requires removal of factory rear sight;Fits Marlin 336 with round barrel and 308MX