BeamQ Rifle Scopes for Hunting Long Range Red & Green & Blue Dot Light Sight Illuminated Crosshair Gun Scope 1.5-4 times adjustable zooming, 30mm objective diameter, 28mm eyepiece inner diameter. Fits 21mm weaver base rail Made of high quality aluminum with hard anodized finish, shockproof and fogproof Red & Green & Blue Illuminated with Mil-Dot recticle and standard X-Y windage with elevation click adjustment Built-in light sight for tactical operations or target practice, precise 1/2 MOA per click.