The Lever Rail system offers a longer rail for more flexibility in optic mounting. Made from durable aluminum with picatinny slots and a hard anodized finish, the Lever Rail allows precise eye relief adjustment with any optic. It's compatible with conventional scopes, scout scopes, and red dots. The Marlin 336 Scope Mount or Marlin 1895 Scope Mount from XS adds veristily to your levergun. Kit Includes: lever rail, screw kit, pillar assembly, blue thread locker, insert with instructions. *Does not fit Marlins with octagon barrel.