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It would become a Illegal SBR (short barrel Rifle) unless you did the NFA paperwork (and it was approved) and paid the $200.00 tax stamp Before doing the modifications

Will, adding a "Brace" would be best as it will still be classified as a standard Pistol. A shoulder Stock of any kind would change this to a "Short Barreled Rifle" SBR and a $200 Tax Stamp and NFA Registration would be required to be legal to own in a "Stock" configuration.