For the ultimate in mounted lights, it is hard to beat the quality and functionality of the Streamlight TRL-1 Rail Mounted Tactical LED Light. This light is capable of producing 630 lumens for maximum illumination, making it popular among military personnel and law enforcement officials. The light features an ambidextrous switch for momentary or steady LED and impact-resistant sealed construction.This light fits onto Glock and Picatinny weapons, but using the included rail locating keys, it can also be used with various Beretta and S&W guns. The actual light housing is constructed from machined aircraft polymer, providing durability and long life.