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I recently (as in Saturday) picked up a 30-06 from another member on this forum. Went to swap out the brake and son of a gun the threadz are 1/2x28, NOT 5/8X24. First time I've seen a 30cal brake or barrel with that thread pitch (I have see 5.56 barrels with 5/8" threads). Aside from the slim chance of a smaller bore muzzle attachment getting put on there are there any other possible issues? There isn't a whole lot metal where the threads are so could pressue be an issue?