Common Reasons:
-If the weapons has more than one ammo type, the ammo it may use could have “Drag support onto item class” and “Drag support onto weapon class” make sure your ammo is using the correct drag onto
-The Weapon should be using the ammo in all it’s references
-the PrimalItem should be using the new weapon
If you miss a reference in the Ammo, Item, or Weapon class it will just ignore everything and revert to it’s default, I get it alot when I copy arrows normally it just uses the weapons last mesh or just doesn’t use the correct ammo