The Fenix GL06 is a compact weapon light that features a maximum output of 600 lumens and 459ft (140m) beam distance which allows you to easily spot your target no matter how dark it is. Specifically designed for compact pistols, this gun light will fit select pistols with barrel lengths of 4” or longer. It will not fit 3” sub-compact models. The GL06 model is used for pistols that utilize GLOCK® or Picatinny rails. Patented quick-release structure and dual tactical tail switches provide users with fast and easy operation. GL06 compact weapon light compatibility Will fit most full-size pistols with a Glock or MIL-STD-1913 (Picatinny) rail. Will only fit a few compact pistols including the GLOCK 36, some Springfield XDs, and Hellcat Pro with barrels 4" or longer. Will not fit other compact models from SIG SAUER, Taurus®, FN®, CZ®, Springfield®, HK®, and Smith & Wesson® Will not fit any sub-compact or micro-compact pistols. The farthest rail notch cannot be less than 1.6875 inches from the trigger guard.