Best yet of the laser grips i've owned - Crimson Trace M&P Full-Size Rear Activation Laser Pistol Grip

This is my fourth CT Laser Grip and is the best of the previous year models. It replaces the back strap on my M&P 9 Pro and feels like the middle size one of the 3 S&W provides. Easy to install and also easy to adjust the beam once you get to shooting. This is the first laser grip, for me, that has the on/off switch. It's a big plus for when you don't want or need the beam. Overall the Grip feels like it came from the factory as original equipment. CT got it right with this one.