This is a Viridian Weapon Technologies Laser known as the Gen 2, model 920-0013.
The Viridian REACTOR R5-R Gen 2 red laser sighting system. This laser sight is easy to install and blends seamlessly into the trigger guard for invisible profile and smooth draw. Viridian's red lasers utilize a 635-650nm laser wavelength to generate the brightest" sharpest red dot possible. These lasers feature 2 modes of operation (constant and strobe) and up to 12 hours battery life. The new gen 2 models feature a new ambidextrous" inside the waistband (IWB)" custom fit holster with INSTANT-ON activation. Made of microfiber" this holster is more comfortable and durable than the previous models. The INSTANT-ON activation ignites the tactical light the moment you draw. No buttons" no squeezing" no doubt. When you draw" it's on.
Features:
Adjustable windage and elevation
Red laser
Mounts to trigger guard
High strength polymer construction