A mobile suit may only be upgraded with 4 additional slots of any weapon type total, with a maximum of 7 slots for a specific weapon type.
All prices are modified by tier!
Melee Slot Install: Installs an additional Melee slot onto your mobile suit, allowing it to carry an extra melee weapon. Cost: 125 Credits x tier
Gun Slot Install: Installs an additional Gun slot onto your mobile suit, allowing it to carry an additional gun. Cost: 150 Credits x tier
Artillery Slot Install: Installs an additional Artillery slot to your mobile suit, allowing it to carry and/or use an extra heavy or explosive ranged weapon. Cost: 175 Credits x tier