The weapons in Acid 2 are standard MGS issue, and they are just as confusing to use as in the first game. If you played the first game, you'll pick up the equipment system without a problem, but if you're new to the series you'll probably struggle for the first few battles. It works like this: You have two equipment slots that you can fill with gun cards. To use those equipped guns, you have to use another gun card that has the same ammo type as the equipped weapon. It's confusing at first, but once you get the hang of it you'll understand that there's a lot more strategy to building a deck than simply using the strongest cards in your library.