Would a device that fired a projectile by means other than gunpowder be considered a firearm?
Thinking a rail gun type of action although could be spring or compress gas initiated. Projectile could be a folding fin stabilized crossbow type of bolt at supersonic velocities. Thinking of shoulder fired as opposed to tripod/gun mount.
I realize that a bolt would be more cross-wind sensitive and for more stability a canted fin to impart spin would be beneficial.
Does this make any sense?