EOTech, EXPS3 Holographic Sight, 68 MOA Ring with 2-1 MOA Dots Reticle, Side Button Controls, Quick Disconnect, Night Vision Compatible, Black FinishThe 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. It is also the optic of choice for the technologically advanced modern rifle hunter. Its night vision compatibility makes it a versatile choice for day or night hunting. Features : Water Resistant Fits