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. It features a Cree LED Tactical light with 100-140 lumen output and a TacLoc ECR Instant-On Holster that releases it smoothly and instantly ignites your light automatically, the second you draw. Included are CR2 batteries.