Clip

The white bar in the lower-right corner of your HUD depicts your clip. The clip is the amount of "bullets" in your weapon. If there are no bullets in your clip you cannot fire anymore. The clip slowly regenerates by itself but of course you can also reload manually (by using your "Reload"-button). The white number above that bar shows how much ammo you have left outside your weapon's clip in your ammo-pack. It decreases if "bullets" are being transferred to your clip. As a consequence, you might have 0 ammo in your ammo-pack but still have some left in your clip to fire.

Clip size varies greatly between guns, and even between the different levels of the guns. For example, the Projectile Rifle shows a full clip, but can only fire once. The PLX-1 Portable Missile System is the same. Grenades do not have a clip bar. Droidekas do not have a clip size, but they do have limits to how long they can fire at full capacity. It's the top yellow bar in the center of their display. Once it reaches the far left, they need to rest a period before it replenishes.