Monstrum Tactical R01C Reflex Red/Green Dot Sight The R01C is an open reflex sight with a compact, lightweight design fit for mounting on rifles, shotguns or even pistols Four selectable reticle patterns, illumination in red and green and multiple brightness settings Flexible eye relief, suitable for almost any shooter or firearm Mounts easily to any Weaver/Picatinny 1913 rail Sturdy anodized aluminum construction with black matte finish