Built specifically for long rifles, the Streamlight ProTac Rail Mount 2 provides bright, powerful light in a machined aircraft aluminum body. This light uses a rail grip clamp system to mount directly to Picatinny rails without the use of tools or putting your hands in front of the muzzle. C4 LED technology and an engineered optic work to produce a concentrated beam of light with three different lighting modes plus a strobe setting, providing the appropriate amount of illumination for any situation. The high mode has an output of 625 lumens, and the low mode boasts an impressive 21-hour runtime. Simply select your mode with the three-position programmable mode selector switch and be prepared for operating in dark conditions. Durable and easy to use, this light is a perfect attachment for long rails.