CZ Scorpion Evo 3 S1 9mm (No Buttstock), FDEPRODUCT DESCRIPTION The CZ Scorpion EVO 3 S1 Pistol is legally classified by the ATF as a pistol, and is intended by CZ USA to be used as a pistol. Under current federal law and ATF policy attaching a stock to this pistol or attaching a device which is then used as a stock or intended to be used as a stock constitutes the making of a short barreled rifle which requires registration with ATF and the payment of the applicable tax. Users of the CZ