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That depends on which law(s) you're looking at. Under federal gun laws about the buying and selling of firearms from federally-licensed gun dealers and transferring guns across state lines, no, an...
There are a LOT of Federal laws- but you are probably looking for Title 18, US Code, Section 922, which defines antique firearm. An "antique firearm" is one made BEFORE 1 Jan 1899, OR a gun that uses...