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Tahj, yes and no. A Should stock would make it a Short Barreled Rifle (SBR) requiring NFA registration and $200 Tax Stamp. A Brace would be completely legal (Several Brace options shown here) : https://www.badassoptic.com/best-cz-evo-scorpion-upgrade-guide/pistol-braces/

Tahj, it is not legal in any state with a stock, that would make it a short barrelled rifle. (Unless you register it with the ATF and pay a $200 tax). You can attach a pistol brace and it would still be legal in Washington state.