This is a Viridian Weapon Technologies Laser known as the Gen 3, model 930-0015.
The new Viridian X5L Gen 3 is the latest version of the original green laser sight + tactical light combo. First launched in 2008 this family of products has continued to innovate through the years. The Gen 3 version is no exception. The X5L is the best and most technologically advanced weapon mounted accessory ever.
Features:
Fits most full-sized railed pistols
Green laser
500 lumen CREE LED light
6 operating modes
Secure universal mounting