To be fair, I am using this on a shotgun. However, even after zeroing it by just lining it up with my iron sights at about 30ft before leaving the range, after getting home and cleaning my shotgun, the movement of that alone through off the zero. And I'm not talking by a few inches. This thing was bout 3-4ft low and left at about 25-30ft after just breaking down and cleaning my gun. So I doubt it would hold it's zero even on a handgun or rifle, as it's intended to be used with. For a home defense shotgun that's intended to be used no more than about a 10-15ft range, it does the job. For anything more than that, I wouldn't trust it.
Pros: Quick and easy set-up
Cons: Doesn't hold zero
This review was written in the old system and had content requirements that are different than reviews written today.