CZ Scorpion EVO 3 S1 Pistol

[Rothbard22]

Hello, my friend had recently purchased the EVO Scorpion pistol. Can He put a folding stock on it and it still be a pistol?

[gryphon]

Adding a butt stock means it is now meant to be fired from the shoulder, so you've created an SBR (short barreled rifle).  You'll need a $200 NFA tax stamp first.  Unless it's one of those arm braces that look similar to a butt stock.