The man says that he is all out of my ammo

Hint 1 of 5:

Only 3 clips of any type of ammo can be purchased.

Hint 2 of 5:

Either restore and use less ammo, or go to another gun.

Hint 3 of 5:

After all, each clip is 100 rounds.

Hint 4 of 5:

You dont HAVE to kill anyone but Merigo and Vrangor.

Hint 5 of 5:

This isn't really a RPG and you get no points for fighting.