EOTech 517.A65 Holographic Sight Weapon sight developed to optimize EOTech's proprietary Holographic Weapon Sight technology Control buttons have been moved from back to left side of unit for instant access; allows for mounting of magnifier or back-up iron sight Portion of front base has been raised to allow sight to fit over standard hand guards found on many M-4 or M-16 style weapons Parallax-free transmission holography optics; 1X magnification and unlimited eye relief; measures 2.1 by 2.8 by 5.6 inches (W x H x D) with 11.9-ounce weight Made in the USA; includes limited two-year manufacturer's warranty