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1/2x28 means 1/2" x 28 tpi or threads per inch.

Anything measured at 1/2x28 will fit on any barrel threaded at 1/2x28.

The only thing the specification does is not specify the depth of the threaded area. So in theory you could have a muzzle device that's not deep enough to cover all the exposed threads on the end of the barrel etc. but that's uncommon.
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