Recently picked up a Glock 40 MOS in 10mm. Did some looking and found the Vortex Venom was the sight I wanted to go with. Installed the Glock supplied plate, threw the Venom on top and it looks like a winning combo. My problem is the red dot itself will not adjust. I have to tilt the front of the gun down in order to see the dot. I turned the elevation screw all the way up and down and the dot didn't move. A few years ago I picked up a Firefield reflex to run on an AR 45 mount. Needless to say that red dot quit working a month after I got it. Replaced the battery and no go. So far I'm batting 0% with reflexes. Is it me? Am I missing something? Before I seek a replacement for the Venom I thought I would throw it out for suggestions here.