This intense beam also provides extensive peripheral illumination for maintaining situational awareness. The rugged X300 Ultra with its T-slot thumbscrew clamp – attaches securely to the Universal and Picatinny rails (fitting more models than ever before) found on most handguns. As always for this best-in-class model, it features integral one- finger ambidextrous momentary- and constant-on switching and can be equipped with SureFire’s optional DG handgun grip switch. This versatile Weapon Light also attaches to the Picatinny rails – more securely than ever before and can be activated via an optional XT remote switch that gives you precision control of the light while letting you maintain a proper grip on your weapon. Fits Picatinny and Universal. Accepts DG and XT remote switches. Attaches securely to both Universal and Picatinny accessory rails.