I have a fastfire III that I just purchased this February and put it on my Rem 870 Super Mag with a B-square mount. The mount is rock solid and also still allows you to see your original sights on your gun for extra insurance that I hope I will never have to use. As far as the dot being hard to find, it is sort of hard to find when not mounted. The dimness may be due to the brightness of your environment. When you first click it on it is on auto adjust, next click is bright, third click is medium and last click is dim for really dark conditions. Haven't messed with the battery yet other than putting it in the sight. I really like the sight and mount. Just my two cents. Hope this helps.