Under federal law, the definition of a firearm under 18 U.S.C. § 922(g) does not include an antique gun. An antique gun is any firearm manufactured before 1898. What if defendant thought a gun was manufactured before 1898, but defendant was incorrect or the seller misrepresented the age of the gun (claiming it was older than it really was). This issue came up in a recent reported decision and the court rejected such a defense. To read about his opinion, please click on the following link.