Ultimate Arms Gear Marlin Rifle Base Top Dual Weaver/Picatinny Predrilled Receiver Mount Adapter Rail, Aluminum + FDE Tan Polymer Reticle Red Dot Open Tubeless Reflex Scope Sight Constructed of Heavy Duty Polymer, Built To Last. Color: TAN Fast Response ON & OFF Switch. Compatible with Both 7/8" Weaver/Picatinny & 3/8" Dovetail Full Windage & Elevation Adjustments Settings For Precise Targeting. LED (Light Emitting Diode) 100% Safe for Unlimited Eye Relief & Field of View.