A new class of weapons.
These types of weapons can be used in both Ranged and Melee.
Examples are Gunblades (not the FF type, but the real life flintlock/blade or Rilfes with bayonets types) and thrown weapons (like throwing daggers/spears) or the existing Sling Staves.
These wepaons would have ammo for ranged as normal, but would not use any ammo in the melee rounds.