As I mentioned in my earlier thread, the NcStar scope I recently purchased and installed on my 7 x 57 Brno lasted for just 3 shots before the focus mechanism crapped out and could not focus the scope anymore. The dealer was very obliging and immediately gave me a new replacement. ( I know, you folks told me NcStar products were junk, other responders indicated if I was dumb enough to buy a NcStar, I deserved to have the problem). In any case, since the unit was replaced with no hassle whatsoever from the dealer, I installed it on the same rifle. I took the rifle to the range yesterday to sight in the rifle. I'm here to tell you that the new unit worked much better than its predecessor which failed after the 3 shots. The fact is the new unit lasted for 13 shots before the parallax feature crapped out. As everyone knows in baseball, it's 3 strikes and your out. In my world of scopes, it's 2 strikes and adios amego. Tomorrow I will be returning this piece of junk and investing in a more reputable manufacturer. Just want to advise all you readers that your negative comments about NcStar units are 100 percent correct. I'll never recommend their product again.