Oh boy! Does THAT question open a can of worms! If a firearm is pre-1898 AND the ammunition is not READILY available, it's considered "antique". So, if my DA was in .44-40 or .45 Colt, I would have to register it since most sporting goods stores carry that ammo in a modern loading. Stupidly enough, if I had an antique cap-and-ball revolver in near pristine condition, it too is "antique". If I buy an modern exact replica by Pedersoli, or Armi San Marco, or Pietta, or whoever, then it must be registered. If I take my revolver into the bush, I must have it in an open carry holster. If I have a shoulder holster, I can be charged with carrying a concealed weapon. We have guys up here who take old .455 Webleys or French Mod.1873, shave the back of cylinder and adapt them to take .45 ACP in the 3 rnd. half-moon clips. Why (you may ask) when .45 ACP is a current cartridge? Sit down for this one! The moronic government functionaries who drafted the legislation didn't know the difference between ".45 Colt" and ".45 ACP". As a result, .45 Colt is deemed, for legislative purposes, to be a modern cartridge. The .45 ACP, not being on the list, it's ok to have an antique revolver adapted to chamber it. HAHAHAHAHAHA! One of my favourite quips; Q. What's a camel? A. A horse designed by a government commitee!