esslnb red dot scope 4 reticles gun sight scope reflex sight for airsoft guns pistol shotgun with 20/22mm weaver picatinny rail mount (black sight scope) esslnb <b>mounting: </b><br>your e/d sight includes an integrated rail that fits standard, dovetailed bases. this is suitable for most applications. because of unlimited eye-relief with the e/d sight, you should provide at least three inches of clearance between the end of led & mirror housing and your eye. set the rail onto the base so that the rail claw align with the crosscut grooves. work the claw into the base until the cross-bolt seats into the groove. securely tighten the locking screw with an allen wrench included in the e/d sight.<br><br> <b>features:</b><br> constructed by aluminum alloy with anodized matte black processing<br> anti-glare reflective coated lenses that gives good optical clarity<br> a 5-position rheostat illumination (red & green)<br> offers 4 different reticles (circle dot, cross, 1 moa) for optimum versatility<br>battery: 1*cr2032(package no include)<br> fully adjustable windage and elevation<br> with integrated mount for most 20mm weaver/picatinny/ris rail<br> rubber protective cover (included)<br><br><b>specification:</b><br>weight:4.1oz/115g<br>objective aperture: 33mm<br>field of view: 15.8@ 100m<br>1 click: 1moa<br>length: 82mm<br>package size: 4.5 x 3 x 2.8 inch <br> <br><b>package includes :</b><br> 1x 4 reticle reflex red green dot sight scope w/20mm rail<br> 1x allen wrench<br>1 x rubber lens cap cover<br>1 x cleaning cloth<br>