This is a Crimson Trace Corporation LaserGrip known as the Lasergrips, model LG-308.
LG-308 laser sights for Smith & Wesson K & L-Frame revolvers feature a comfortable rubber overmold grip that provides ideal comfort and security for large caliber revolvers. The laser activation switch is located in the front of the revolver' Lasergrips(R)" making activation "instinctive" when you assume a normal firing grip on the revolver.
Features:
Pressure activation
Red laser
Factory sighted at 50Ft
.5 inch diameter at 50 feet
