depends which one your using..although there all the same concept for the one I use you CANT have:
- original pistol, ray gun, & ballistic knife (not sure about magnum)
- everything else is good, you can upgraded any of the other guns, you can buy the bowie knife.
I usually upgrade 2 guns first then do the glitch..most likely try for the thundergun and HK/RPK..then do the glitch, get the ray gun, and when i really need ammo, put it back in the box and get it again