Aimpoint CompM4 and CompM4s sights both include enhanced ACET technology that provide up to eight years of continuous use from a single AA-size battery. Once turned on, Aimpoint sights stay on — there is no automatic shut-off, so your optic is always ready whenever you need to use it. The CompM4 and CompM4s incorporate an integrated mount that eliminates the need for a separate ring, and can be customized with vertical and forward spacers to fit a variety of weapon systems. All CompM4 sights are shipped complete with a QRP2 mount and standard AR15 spacer. These sights also come equipped with a killFlash anti-reflection device and MILSPEC rubber lens covers. MSRP $850.