Base Defense is a single/cooperative modification based on horde-style and RPG systems. It's awesome, you should try it ;)
All week I was busy finding old bad bug.
Now I continue HUD works.
Crosshair works the same way as in HL2.
Left bar is HP and the right one is ammo.
When HP/Ammo bar go lower than 25% it's turning red.
Like it, does it indicate ammo like the HL2 crosshair
Yes, it does.