The laws as I know them are as follows. Artillery can use the "Artillery" stock only even if it's a repro. The Navy can only use the "Navy" stock. If you were talking of a 4" gun then the only way to do that would be a Form 1 and register it as an SBR.
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Suppose you were an idiot.....and suppose you were a member of Congress.....But I repeat myself" ~~ Mark Twain
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