Disappointed - LaserLyte Quick Detach Universal Rail Mount System 59476

Bought this set up from Bass Pro Shop and put it on my S&W 40 Sigma. Not impressed at all. First of all I purchased this because it said that it fits all handguns with a rail. Not True!
So I had to purchase an adapter to fit my sigma. Once I mounted it on my pistol I calibrated it and that was pretty easy. So a few days later I took it to the range to try it out. After I squeezed off the first round the laser went out. I had to fiddle with the switch to get it back on. So I popped off a few more rounds, same thing. I also noticed that the switch cap twisted after I shot a few rounds.
So I am not very impressed with this system.
Pros: Easy set up. Easy to calibrate.
Cons: Laser fades in and out. Switch cap not real secure.

This review was written in the old system and had content requirements that are different than reviews written today.