Weapon Upgrades

Find weapon magazines scattered around in towns that advertise the new weapons. Next (and this is the hard part...) you need to find the neccessary items that are required to make the upgrade. When you go into the weapons shop take a look next to the new weapons listed and you will see the ingredients neccessary to make it (the number in parenthesis is how much you currenty have, the number outside is how much you need). Unfortunately, since each weapon has different requirements you are going to have to explore the overworld and fight a wide variety of enemies to try to collect the neccessary items, and most of the time the useful weapons have one or two really rare items you need to find, those aren't easy to track down.