Light and Compact. Accurate and Fast. The Aimpoint Comp red dot sight works in all weather conditions. The CompC3 is ideal for scout rifles, bows, carbines, and competition pistols. The CompM3 is compatible with every generation of night vision devices and often used by law enforcement and military personnel. The CompM4 works well for hunters and sport shooters and is optimal with third generation night vision devices. The CompM4s is identical to the M4 with the exception of a low battery compartment for additional visibility.