Ohio Revised Code Title XXIX. Crimes Procedure § 2923.201

(1) Change, alter, remove, or obliterate the name of the manufacturer, model, manufacturer's serial number, or other mark of identification on a firearm.

(2) Possess a firearm knowing or having reasonable cause to believe that the name of the manufacturer, model, manufacturer's serial number, or other mark of identification on the firearm has been changed, altered, removed, or obliterated.

(B)(1) Whoever violates division (A)(1) of this section is guilty of defacing identification marks of a firearm. Except as otherwise provided in this division, defacing identification marks of a firearm is a misdemeanor of the first degree. If the offender previously has been convicted of or pleaded guilty to a violation of division (A)(1) of this section, defacing identification marks of a firearm is a felony of the fourth degree.

(2) Whoever violates division (A)(2) of this section is guilty of possessing a defaced firearm. Except as otherwise provided in this division, possessing a defaced firearm is a misdemeanor of the first degree. If the offender previously has been convicted of or pleaded guilty to a violation of division (A)(2) of this section, possessing a defaced firearm is a felony of the fourth degree.