Ultimate Arms Gear Polymer Reticle Red Dot Open Tubeless Reflex Scope Sight Weaver-Picatinny & Dovetail Mount Adapter Rail, Black for Excalibur Crossbow Constructed of Heavy Duty Polymer, Built To Last. Color: Black. 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.