The Uni-IR is the smallest and most lightweight IR laser available. It requires just 1.75” of any Picatinny or Weaver rail and has an additional rail built to mount other accessories. Mount on a pistol and the slide switch activation accommodates right and left-handed shooters. Or, opt for a Mantarail and momentary activation switch and attach to any rifle or long guns. The Uni-IR takes just two 357 Silver Oxide Batteries for over 6 hours of run time.