It's interesting how the various Italian-made cap and ball revolvers are real, actual, functioning shootable replicas of the original Colt, Remington, and etc., and are just as accurate, powerful and deadly as the originals, yet The Gooberment doesn't classify them as firearms.
Still, a friggin' cheeseburger should be able to verify at a glance whether one is loaded or not. No caps, no balls in the chambers, no shooty. Unloaded, it's just an unwieldy club, or an interesting prop. Not a "firearm", not loaded, should be legal to wear in public.