Not exactly sure of your question as there have been numberous over the years. If your referring to a threaded barrel like a rifle barrel then Savage comes to mind. On the other hand if your referring to take down barrels where the threads were notched on the barrel and receiver so inserting one into the other and turning 90 degrees resulted in an assembled shotgun. Winchester Model 97, 12 and 42 comes to mind as well as Remington plus other manufacturers. Mossberg bolt action shotguns from a by-gone era are another possibility.
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