Another semi-related point which just popped into my head is heat build up. I can't recall any rule system that adequately, or even vaguely touches on the need for barrel changes, water cooling, etc. They all just assume you can simply squeeze off a few thousand rounds in a couple of minutes and not have the barrel melt.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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