Well, isn't that the idea behind chain guns? They shoot so fast that they need to rotate the barrels or else they'd destroy themselves.
Although I still find it doubtful that you could significantly overheat the barrel with just a couple mags.
I found a really cool site that I think might be able to help you out. It covers a very wide range of different gun topics, so I think you'll be able to find the answers that you're looking for.
Here it is!
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