Ran into my first problem with the Hot Dot, seems the battery connection will loosen up after shooting several shots. At first I noticed the light getting dim andI replaced the battery, but after about two dozen shots the light became dim again. I checked the connection and it appears the battery will loosen up, it's only held in place by a thin clip and the cover puts pressure on it by using a small piece of foam, the foam had compacted to the point that it was allowing the battery to slip. I replaced the foam and now it works fine. I'm going to send an email to Summit. I still love this sight