To add a problem to weapon hoarders let the gun weight stack each other so carrying 3 heavy weapon will greatly affect your movement and carrying a whole set of guns will make you more immobile
Ammo Box: Since we will have limited ammo for pb 2.5 what if you lose all your reserve ammo and you already throw all your grenades then Ammo Box will help you. It will take atleast 10 seconds to refill your lost ammo to avoid ammo box camping and they are good for 5 uses if that ammo box have been depleted well the ammo box will teleport and there will be a new ammo box in a random area after 30 seconds. You could also fix it to respawn in a fix area and have unlimited uses