The electronic components in the CompM4 improve upon Aimpoint's existing state-of-the-art ACET diode circuitry, allowing for over 8-years runtime on a single AA battery. The sight features a 2 minute-of-angle (MOA) dot size, making it perfectly suited for use with Aimpoint's 3x magnifier scope module. The CompM4 is optimized for use with all generations of night vision devices, and features an extremely rugged and easy to use 16-position manual switch with 7 night vision compatible settings and 9 daylight settings. The CompM4 sight body is designed to protect both the optics and adjustment components against hard use, and is waterproof to 45 meters. The CompM4 also features an improved QRP2 Picatinny rail mount, eliminating the need for a separate mounting ring. Vertical and cantilever spacers are available to allow the sight to fit on all M16 rifle and M4 carbine variants and can be used on any other weapon with a Picatinny rail mounting system.