Grapeshot it sounds as if Florida considers "antique" both firearms and firearm design such that even a component (the firearm) built using the antiquated design requirements or with antiquated design function meet the definition of an antique. I could see the usefulness of this particular methodology, especially if you have a clever legislator who knows that modern firearms are banned somewhere and he doesn't have the political capital at that moment to get the restriction on modern arms lifted. By defining antique arms to include even arms that are made today, but to an antiquated design then you have a way around that restriction for people carrying antique arms if your clever methodology is not spotted first.