The E is for Extreme. The EXPS3 offers true 2-eyes-open shooting and a 7 mm raised base that still allows for iron sight access. It features easy-to-adjust side buttons and an adjustable, locking, quick-detach lever for easy attachment and removal.3.8 x 2.3 x 2.9 (96.5 x 58.4 x 73.7 mm). 11.2 oz (317.5 g). 1 Weaver or MIL-STD-1913 rail. 10 additional settings for Gen I through III+ night vision devices. 600 continuous hours at nominal setting 12 at room temp. Then select "Return this item" from the drop-down menu. You will then need to select a reason for your return. We value our customers and strive for excellent customer service. The item "EOTECH EXPS3-0TAN Holographic Weapon Sight 68MOA Ring & 1 MOA Dot Recitile NEW" is in sale since Thursday, October 17, 2019. This item is in the category "Sporting Goods\Hunting\Scopes, Optics & Lasers\Red Dot & Laser Scopes". The seller is "bigfishbuddy" and is located in Key Colony Beach, Florida. This item can be shipped to United States.