I bought a BSA panoramic red dot for my 22/45. I get to the range, mount it, turn it on, and fire. Fire 5 shots and all of them hit about 6 inches low. I think to myself, no problem. I turn the elevation screw 4 clicks and fire 5 more shots. Point of impact does not move at all. So I turn the elevation screw 4 clicks and fire 5 shots again. I probably do about 50 shots this way and with every 4 turns the point of impact barely moves. So i'm like, fuck this and go to the next gun. I get home, hit Google, wondering why the fuck it's so hard to get the elevation to change. I probably turned the elevation screw a total of 30 clicks and it's barely moved half an inch. I'm reading a review on Midway when someone mentions a "locking screw". I'm like, "Where the fuck is that?" I look around on the sight when I find this teeny tiny hole. I'm like "Aha! I bet that's where that teeny tiny hex wrench goes." So I get the teeny tiny hex wrench, stick it in the teeny tiny hole, and do just a little teeny tiny twist. And then... *boing!* The rear of the sight pops up about half an inch, my guess is due to all the pressure exerted on it by my 30 clicks on the elevation screw. So I guess I need to read my manuals from now on. It would have helped if they at least marked the screw, like they did the elevation and windage screws.