Why not Ohio?

Ohio unfortunately is one of a few states that state law focuses on the barrel length rather than the overall length of this weapon. Details are here : buckeyefirearms.org/mossberg-590-shockwave-legal-ohio

Ohio has a restriction on Barrels under 16 inches buckeyefirearms.org/mossberg-590-shockwave-legal-ohio

Ohio has a restriction on Barrels under 16 inches

These are legal in Ohio now. the only restrictions in OH are batons. budsgunshop.com/catalog/feeds/state_reg/ohio_restrictions.pdf