There's a bug in the PlayStation version of the game that allows you to transfer your weapons from one level to another, or even between characters (though they sometimes change dependant on the character).
It's been a long time since I played the PlayStation version, so I'll tell you what I remember.
You need to load a saved game, preferably one with lots of weapons/ammo. You then need to load another saved game and purposefully die in that save game. Instead of reloading, choose to restart the level and you will start with the weapons of the first save. As I said, there are exceptions: for instance, if you try to transfer Obi-Wan's weapons to Panaka, then Panaka will receive more ammo and an R-65 Heavy Blaser instead.