I have a Burris Fastfire III 3moa red dot and have not managed to run the first batteries out yet. There is an automatic 8 hour shutoff. From what others say of the battery life I am not expecting to need to change the batteries for at least another 8-12 months, but apparently it should indicate to me when they are getting low. Love it though, been very happy with it so far.
I would avoid magnified optics on a home defense rifle. If you do use a scope, consider a 1x and a rifle mounted flashlight.
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