Crimson Trace Corporation CMR-301, Rail Master Pro Tac Light/Green Laser, Universal Rail Mount, Matte Finish, Black 01-00020 The CMR-301 Rail Master Pro offers robust power and versatility for rail-equipped rifles and carbines. An aluminum body houses a laser sight + tactical light system that provides 1000 lumens (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. Fits standard AR-type modern sporting rifles with M1913 Picatinny or similar accessory rails measuring at least 23/4" in length.