Ultimate Arms Gear Marlin Rifle Base Top Dual Weaver/Picatinny Predrilled Receiver Mount Adapter Rail, Aluminum + Polymer Reticle Red Dot Open Tubeless Reflex Scope Sight Package Includes: Ruger 10/22 Mount + Reticle Sight Constructed of Heavy Duty Polymer, Built To Last. Color: Black. Fast Response ON & OFF Switch. Full Windage & Elevation Adjustments Settings For Precise Targeting. LED (Light Emitting Diode) 100% Safe for Unlimited Eye Relief & Field of View. Compatible with Both 7/8" Weaver/Picatinny & 3/8" Dovetail Fits Most Marlin Rifles: 1894, 1894C, 1895, 45-70, Model 9 9mm Camp Carbine, XT-17 and many more. Holes are Predrilled for Easy Installation.