Could be done, but a lot of paper work and tax stamps would most likely be required. Probably would not be considered a pistol when you were all said and done.
Why would you want to add a stock to it?
Probably would be easier to get a rifle and put on a short barrel and license it as a short barreled rifle. If you start with a rifle and keep the barrel over 16" then no licensing or paperwork is required.
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