This game will become a mix of RTS and RPG. Playing in an future not too far with a Little touch of apocalypse.
Here's the Gun-Turret in several Upgrade states. As you can see you'll be able to upgrade from 1 up to 4 Barrels, Magazine Upgrades that increase the amount of Bullets before Reload, an Armor SteelPlate for defence reinforcement are only some of the Upgrades that can be applied to this Turret.