SureFire" s M600 Ultra Scout Light produces a 500-lumen maximum output, focused by their TIR lenses into tight 13,000-candela beams with impressive reach and sufficient peripheral light to maintain situational awareness. The M600 Ultra uses a thumbscrew clamp to mount to long guns equipped with Picatinny rails. It is activated with either a click-type tail cap switch or a remote tape switch (both included).