Please permit a couple of other comments.
If the combination is either registered as a short barrel rifle or has been removed from the purview of the act in one way or another, there is no reason in the world you cannot shoot it (other than needing high quality ear protection). (You can shoot an illegal gun, too, but it does tend to call attention to yourself.)
If you want to buy a stock and a pistol and put them together legally, buy the gun, then apply for and obtain the tax stamp BEFORE acquiring the stock.
Jim
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