Just simply loads all the cod 4 weapon files that are related to guns that are in the game.

Instructions:
Download and put folder in yours mods folder

Open the folder and right-click on the "AllSPGuns" shortcut and change the target and start in cod4 directory to your cod4 directory but dont change the "+set fs_game mods/AllSPGuns +set thereisacow 1337" on the end of the target and then click on the shortcut.

COD 4 should launch with a dark blue color scheme to indicate that a mods loaded and from there you just any more you want with "/spdevmap" and start giving your self weapons

If you want to know the weapon code names then open the mod.csv file inside the folder you will find them all