Aimpoint M4 2 Minute of Angle ACET CompM4 Sightbr Part of Aimpoints highest-end series sight features improved energy efficiency high battery compartment and internal voltage regulator that allows operation on any AA battery br Integral mount eliminates need for separate ring and can be customized with vertical and forward spacers to fit variety of weapon systems br Unique coating on front lens reflects dots selected frequency of red light at near 100 efficiency to give highest possible dot brightness with least amount of energy br Shipped with QRP2 mount and standard AR15 spacer and killFlash anti-reflection device and MILSPEC rubber lens covers br Includes limited manufacturers warranties of two years for professional or competitive use and ten years for personal or recreational use