I was at a gun show near Youngstown Ohio ,this weekend . Saw shockwaves for sale .I asked the same question , you can have but do not shoot . This is what the man told me
The Mossberg Shockwave has a barrel length of 14". Accordingly, with a barrel of less than 16" long, it is considered a "Sawed-off firearm" under Ohio Law. In Ohio, there is no barrel length exception, even with an overall length of 26” or greater. link buckeyefirearms.org/mossberg-590-shockwave-legal-ohio
Dylan, simple case of State Law overriding Federal Law plain and simple. Details here : buckeyefirearms.org/mossberg-590-shockwave-legal-ohio
Ohio law says any barrel under 16" is considered sawed off and under state law that weapon system is illegal
Dylan, The only real issue with Ohio is the state says the firearm cannot be modified by a third party from the manufacturer. So I don't know what the caveat is with the regs. Unless a third party adds something like pump strap or birdshead stock after the rest of the firearm is manufactured. I can't find anything about the 14" barrel, but that might be it. Dylan, I did find that Ohio considers this a "sawed off shotgun" even though BATF says it is a firearm. That is why you can't get it in Ohio.