Let's say you have a 16 inch barreled AR and shoot XM193 at around 3,000 FPS. 3,000 FPS for 16 inches works out to 0.0004 seconds of dwell time in the barrel per round.
If your barrel lasts for 10,000 rounds, then you could say that your barrel life is around 4 seconds.
Thought someone might find that interesting. It's not really news but it's neat if you've never thought about it in that way.


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