Ncstar VD4BKM KeyMod Quick Release 4 Reticle Reflex Optic sight with 4 reticle and new Patented KeyMod quick release mount. You can put it onto any KeyMod™ handguards at an offset angle (30°/45°) for a secondary optic to your primary, for close range target acquisition and for moving targets. You can also mount it directly to the top KeyMod slots of our AK KeyMod Mount Receiver Cover. Selector switch at the back of the optic, allows you to select the desired reticle. RED colored four reticle set: Dot, Bullseye, Cross, and Bullseye LED (Light Emitting Diode) 100% safe for the eyes. Unlimited eye relief for flexible mounting. 7 brightness settings for reticles. Black anodized aluminum construction. Tools for adjust Reflex optics and rubber lens cap are included. Featuring NcSTAR's US Patented Auto-Locking KeyMod™ Quick Release mount. Mounts directly to KeyMod™ slots with a flip of a lever, no tools required. Tools for adjust Reflex optics and rubber lens cap are included.