I use it on my bps 12 ga nwtf for 3 years now and i hunt hard and have dragged my pump through everything.I have not missed with it on my gun and i have never had to tighten it or anything since the day i installed it before the 2012 season.I just tagged out yesterday using the sight.I prefer it over any other one i've tried over the years,including red dots,scopes and other fiber optic sights...Well worth the money.....