Let’s see. To be an assault sword, would it need to have a bayonet lug?
In that line thought, would a satin finish on the blade qualify as a flash supressor?
An assault sword would be a small foldable sword.
i.e. a pocket knife
To create assault sword laws comparable to assault rifle laws, full sized full power swords are legal. Folding pocket knives are illegal. Just like full sized full power 30-06 rifles are legal, but select 223 caliber collapsable rifles are not legal.
A switchblade knife would be comparable to a submachinegun.
A sword with a bayonet?
That's a whole new level of coolness!