Turning the mouse wheel is the default action to change weapons in FPSC, much as in other games. For some reason, and I don't know if it's a bug or should be normal, the player still (obviously) has the weapon after dying, but he is no longer equipped. It seems that if you were holding it when you entered the checkpoint, you should be holding it when you're sent back to the checkpoint.
Along the same lines, if you killed any enemies after crossing the checkpoint, when you're sent back, are the enemies there again or are they already dead/gone? I can't remember.
Brian.
If my post seems rude or stupid, don't be offended. It's just a failed attempt at humor.