The Aimpoint CompM4 series of sights are the finest that Aimpoint has ever produced. Improvements include improved energy efficiency that provides up to 8 years of continuous use from a single AA battery! The CompM4 sights incorporate an integral 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.
The CompM4 offers a high battery compartment, while the CompM4s offers a low battery compartment. In all other aspects, they are identical.