While in the game, hit the "`" key to bring up the text screen. Then type any of these codes:
|give (weapon)||Give Weapon (See List)|
|give (weapon)ammo (ammo amount)||Give Ammo for Weapons (See List)|
NOTE: Certian weapons aren't evalible in all levels. To get them just type their name and drop the word ammo. For the amount of ammo type 1. Also, most weapons can only hold a max of 200 ammo.
Those weapons are:
(Example: give bazooka 1)