Aimpoint 3XMag Magnifying Module
http://www.amazon.com/gp/product/B001I4A73M?tag=sukses2015-20
Tactical magnifying module is specially designed for compatibility with Aimpoint sights
When combined with Aimpoints patented TwistMount device offers ability to rapidly switch from close quarter battle to long-distance semi-sniping modes of operation
Rapidly change from non-magnifying to magnifying while keeping sight on firearm can also be used as handheld magnifying glass monocular
Measures 17 by 16 by 43 inches W x H x D 71-ounce weight including rubber cover 20-millimeter objective diameter
Includes limited manufacturers warranties of two years for professional or competitive use and ten years for personal or recreational use