NcStar DMP5 LED (Light Emitting Diode) 100% safe for the eyes Anodized aluminum body Unlimited eye relief and field of view Seven position rheostat knob for multiple brightness settings Integrated MP5 style mount Powered by three volt lithium battery (CR2032) Includes extra battery, lens covers, mounting tool   MAGNIFICATION:1X OBJECTIVE DIA(MM): 45.00 RETICLE: RED DOT DOT SIZE:3 MOA CLICK VAL: 1 MOA EXTERIOR FINISH: BLACK ALUMINUM LENS COATING: RUBY N.W. (OZ.): 5.50 LENGTH (IN): 3.39 MOUNT : INTEGRATED MP5 STYLE

This unique sight requires no external mount to fit on your GSG. It sits low enough that looking through the rear sight is required and co-witness is absolute. The glass is crystal clear and the fit and finish are beautiful. 
This sight is ideal for use on your GSG 5 carbine or MP5 for plinking or duty use. Rifle not included.