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It's done by time, not by number of rounds.

If you're firing "slow fire"--less than 25 rounds per minute--change it every hour. If you're firing "rapid fire"--up to 200 rounds per minute--change it every half hour. And if the barrel starts to change color--it will first glow dull red, then brighter red and finally orange--change it right away. (If it DOES glow orange, the barrel is ruined and you'll probably have to pay for it unless you were in the middle of a firefight when it happened.)

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Q: How many rounds can you fire before changing the barrel of a .50M2HB cal machine gun?
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