http://cz-usa.com/product/cz-scorpion-evo-3-s1-pistol/
Direct from the horse's mouth: Our favorite accessory for the Scorpion pistol is our new arm brace adapter, which quickly and easily adds an AR-style pistol buffer tube to the rear of the action, enabling the use of an arm brace for added stability.
So you can add an SB15 Brace for mock-sbr-non-nfa lovin'