The XS Lever Rail upgrades the Marlin 336 and 308MX with round barrels 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. Rail mounts to forward receiving holes and rear sight dovetail with a pillar assembly. 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 and 308MX with round barrel