The Viridian CTL is so tiny, it tucks neatly between trigger guard and muzzle, with no overhang, and will work with virtually any railed gun. CREE LED Tactical light with up to 140 lumen output. Combined with the TacLoc ECR Instant-On Holster- the package is complete- batteries included. Drawing the Viridian from the TacLoc ECR- Instant-On holster releases it smoothly and instantly ignites your light automatically, the second you draw. It's the most advanced, most effective carry setup you can get. The complete package for your favorite gun..