Good sight, but shakes loose - NcSTAR Red Dot Sight - 1x42 B-Style - Weaver Base

Got it for the large view area and small dot. High marks in those areas. The dot doesn't cover up the target, stays very small, and is bright enough in sunlight even on the lower brightness settings. Sighted in quickly. Adjustments click nicely and seem solid. Only problem is that on my 9mm carbine the mounting screws come loose after 10-20 rounds. That rifle doesn't have much recoil. Could be the cheap rail on my rifle is part of the problem, but when I tighten it down I expect it to stay there. Doesn't get loose enough to fall off or anything like that, but definitely has to get tightened every few shots. Once mounted, sighted in, and tightened down, I am able to group shots consistently to my satisfaction. I did not have to sight it in after taking it off and putting it back on, as long as I used the same distance, of course. Note that one of the two mounting screws can be adjusted forward/backward a little bit, giving you a bit of flexibility in mounting.
Pros: small dot, bright dot, large view area
Cons: mounting screws won't stay tight

This review was written in the old system and had content requirements that are different than reviews written today.