OK I'm looking for a scope to put on my AK and am kind of thinking about a red dot scope because I like the fact that its compact and good for rapid target acquisition but have never used one and have some questions. 1-The scope I have kind of looked at has a dot that is 5 MOA. I figure you cant be much more accurate than the area covered by the dot so how large an area would that cover at 100 yards? 2-It runs on a 3v lithium battery and I was wondering if anyone knew a ballpark of how long the batteries normally last with the scope on? 3-If the power is off or the battery goes dead is there anything at all in the way of an aiming point or are you totally without sights then? 4-Are there other scopes that would be compact and low priced that would work well on an AK? I'm sure I will have more questions later but this would at least give me some of the basics, thanks.