Ultimate Arms Gear Tactical TAN Multi 4 Reticle Red Dot Open Tubeless Reflex Scope Sight Adjustable Brightness with Weaver-Picatinny 7/8" Rail Mount Ultimate Arms Gear Tactical TAN Multi 4 Reticle Red Dot Open Tubeless Reflex Scope Sight with Weaver-Picatinny 7/8" Rail Mount Adjustable Brightness