Hi Earl,
Ohio requires any long guns to have a 16" barrel. This would be why the model in question cannot ship to your state. Hope you are able to find a model that works. Here are a couple links to some other similar Remington shotguns.
budsgunshop.com/catalog/mobile/product/24983/remington_870_express_tactical_12_gauge_185 />budsgunshop.com/catalog/mobile/product/24984/remington_firearms_81199_870_12_gauge_185_3_black_synthetic_s

because Ohio says the barrel must be 16 inches long or longer and the shockwave is a 14 inch barrel buckeyefirearms.org/mossberg-590-shockwave-legal-ohio

because Ohio says the barrel must be 16 inches long or longer and the shockwave is a 14 inch barrel buckeyefirearms.org/mossberg-590-shockwave-legal-ohio

Earl, this is because of Ohio state law and their interpretations. Details are here : buckeyefirearms.org/mossberg-590-shockwave-legal-ohio