ACET technology allows up to 80,000 hours (over 8 years) of daytime operation on one AA battery
Internal voltage regulator allows the CompM4 to be used with any AA size battery
7 NVD settings and 9 daylight settings
QRP2 mount has twice the clamping force of the original QRP, and the mounting knob is wider and shorter to improve operation and lower the risk of snagging on other gear
Mount base is keyed into to the body of the sight to absorb recoil