Relatively happy with purchase - ArmaLaser GTO/FLX Finger Touch Green Laser Sight for Springfield Handguns

This device is very compact and works very well. The green dot is easily visible. I was pleasantly surprised at how easy it was to find holsters that accommodate the sight under the barrel. But I was unpleasantly surprised when, while discharging a 16-round clip in my Springfield 9mm, the laser sight fell right off of the weapon because the mounting bolt had loosened and fallen out. I never did find that bolt. Fortunately, the laser sight came with a spare mounting bolt. But now I know that I’ll need to tighten the bolt at least after every use, and possibly even more frequently.