The CMR-301 Rail Master Pro offers robust power and versatility for rail-equipped rifles and carbines. The laser sight + tactical light system provides 1000 lm (peak) for illumination and a powerful green laser for precision targeting in variable lighting conditions. The CMR-301 is user programmable and may be operated with pressure pad or tail-cap. Features: Fits standard AR-type modern sporting rifles with M1913 Picatinny or similar accessory rails measuring at least 2-3/4 inches length