Throat erosion is the big killer of AR accuracy over time. Really there is not much you can do about this but you will be well into 20,000 rounds (depending on how hard you run the gun) before you have to think about it.
Keep in mind, distance = time. The further the target is, the less of a threat it is, the target is smaller but you have more time to engage it. The closer the target, the more of a threat it is, but the target is bigger and you really only need to worry about 'practical accuracy.' If your hot gun opens up from sub-MOA to 2 MOA, this really won't make a difference at normal combat distances.
Mag dumps may impress the poorly trained and uneducated but they really don't accomplish very much. In combat, the guy standing in one spot laying down silly amounts of suppressive fire will become a fixed target and bullet magnet - shoot, move, communicate. This never changes.
Check out this shoot out vid. This guy is a discharged Marine with actual combat experience using an SKS to effectively engage at least 3 LEO's. Good tactics are essential:
http://www.youtube.com/watch?v=IUYgr...has_verified=1
http://www.youtube.com/watch?v=pgBEv...eature=related
By the way, he dies in the end, because you can't out run a radio! Remember, shoot, move, communicate.
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