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. This model is equipped with a folding SB Tactical arm brace and wears the forend of its larger brother, the Carbine. With the same 7.7 pistol barrel, owners can unscrew the 5 KAK Flash Can and install most pistol suppressors under the handguard, keeping the overall length down. Dual threads of 181 and 1/2x28 make fitting a suppressor simple.