With this code you can put more than 6 rounds into your grenade launcher at once. If you have 6 fire rounds in your grenade launcher, and you have 138 regular rounds in your item box, combine the ammo onto the grenade launcher with the fire ammo in it (it works with any ammo as long as the two are different) and the 6 fire ammo should be in your item box and the 138 in your gun! No reloading.