I purchased this sight for a Beretta Neos (.22LR pistol with picatinny rail). I had read reviews of this not holding zero, but with a shotgun or a .44 - this sight was meant for a .22LR. The allen wrench supplied worked for attaching and adjusting. The sight is still accurate after over 500 rounds. I could see the laser clearly on a partly cloudy day on a 3 setting (goes to 7). I have no complaints on this sight, perfect for any .22 with a picatinny rail and you can't beat this price for this good of a sight.
Pros: Easy to attach and adjust, perfect for a beretta neos
Cons: None!
This review was written in the old system and had content requirements that are different than reviews written today.