So after you beat the game, you can buy guns and I read that you can use them any time. I'd like to buy them as I go through the game a second time in pursuit of more trophies and on a harder difficulty level . Yes... it's that fun... But my brother and I once a year switch consoles for about 3 or 4 months. He's got a 360, and I have a PS3. This way we get to enjoy both. But... I don't want to buy guns if they will be available to him when he plays through the game. He's going to want to play through the normal, default game. So if I buy stuff to play with now, is it possible for him to play the game w/out all the purchases?