One of the first makers of RedDots, was Tasco. In fact, the very first one I ever saw, came in a 1" tube. My first mount was a ProPoint-I, that I mounted on a 12Ga. slug gun. Both took many deer and even more shots, without any issues. The only one being that the light filter would rotate but the dot still held on point. I also have a ProPoiunt-II on a .44mag revolver and again, no issues. Since then, I have accumulated quite a variety of dots and they too have provided super performance. There are so many choices out there and let me suggest an UltraDot. .....
I sometimes wonder if most of these come out of the same asian shop and they just stick a name on them, based on the selling price. ...
Be Safe !!!