There's "legal" and there's "legal". It may be legal to own one in Ohio, IF you've done all the Federal paperwork, fees/taxes/etc. In many states, even if you've satisfied the Feds, it's still illegal under STATE law. Check the law closely before you get into a world of trouble. No regular/reputable dealer will sell you one without the right paperwork. In the eyes of the law, suppressors and silencers are the same thing ... not to be confused with flash hiders, porting or and recoil reducers. If the purpose is to reduce the noise, it's a silencer (even if it isn't truly silent) ... and you need (at least) a Federal permit (actually a tax stamp).