If you have completed the game in under 5 hours you get the unlimited RPG if you can upgrade all weapons to the max buy the unlimited ammo for the 3rd revolver that does 5000 damage per shot. Then if you can upgrade a sniper and shotgun to max get unlimited ammo. If you can afford it give the same shotgun, sniper, revolver and give the RPG to sheva. then go through it on your own. It's alot of work but it does work I did this with chris having the shotgun revoler sniper and 2nd machine gun. Don't forget to turn unlimited on. Hope this helps.