It depicts how much ammunition is available for the secondary weapon (weapon other than Handgun or Totec's Spear) and the amount decreses as the secondary weapon is fired. Some weapons consume much more ammunition than others, making the Ammo Bar decrease much faster.
- Extend the Ammo Bar
- Refill the Ammo Bar completely
- Partially refill the Ammo Bar
- Description on the in-game information text that appears on screen