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Barrel ring can be of two types: a ring like the noise from a bell, or a ring that you put on your finger.
Tapping a shotgun and listening for it to ring is an old school method of evaluation. I recall a story where a blacksmith was out of business because lightning had hit his anvil and it had lost its ring (rendering it useless). Some shotgun barrels actually have an ring to them when fired similar to an anvil being struck.
Then there's the ring gauge, or dimensional reference. Anyone familiar with a machine shop knows about ring gauges. They can be used to make direct measurements or for the calibration of other instruments. So, say you're a gun maker and you send a batch of new guns to the proof house. One of them is rejected because its bore diameter isn't with in the government specification -- as verified by the proof house's reference ring gauges. It could be said that the rejected barrel didn't ring. The same concept applies to over-sized bowling balls, you can DQ a tournament if your ball doesn't ring.
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