Just wanted a dot sight while I saved up money for what the gun guys said I needed, a dot sight that cost several hundreds of dollars. Took it to the range to sight it in and wow, this works great. I got it zeroed then tried to dislodge it. Fired 4 mags as fast as I could, retested zero, which was spot on, then fired 3 more mags rapid fire. Final zero test was spot on again. Have fired more than 12 mags now, with no problems from the unit. Light is good, with three brightness levels for both red and green. Multiple choices for what kind of dot you see and it is holding zero perfectly to this point. For now, I am not going to spend more money on a different sight, I will put that into ammo, if I can find any.