Lightweight scope rail with backup iron sights mounts to Marlin lever rifles without drilling and tapping. Features a large light-gathering rear ghost ring and high-visibility front post sight for fast sight acquisition during day or low-light conditions. Rear ghost ring is fully adjustable for windage and elevation, and includes interchangeable .191" and .230" diameter apertures for fine-tuning accuracy. One-piece front sight has easy-to-use .100" wide, white-line post. Rail accepts Picatinny or Weaver-style mounts. Extra-long design allows scope mounting directly over the receiver, or forward over the barrel with intermediate eye relief optics or red-dot sights. Requires removal of factory rear sight. Gunsmith installation recommended. If there's 2 front sight holes, no modifications are necessary. However if there is only 1 hole for the front sight, drilling a second hole is recommended, but is not required. Specifications: - Fits: Marlin 336 (Round Barrel Only) - Finish: Matte Black - Includes mounting hardware Lever Rail: - Material: Anodized Aluminum - Dimensions: 11" L x .830" W - Weight: 3 oz. Sights: - Material: Blued Steel - Ghost Ring Apertures: .191" and .230" - I.D. Front Post: .100" Wide White Line.