At the moment, turrets are extremely limited, as you have to fit the whole master, slave, and effect modules, as well as the computer, in one part of the turret. This restricts the ability to build effective weapons, and makes battleship-style guns (with a rotating base and elevating barrel) extremely weak and impractical. With the ability to link a "master" weapon system in a barrel to a "slave" and effect system in the base of a turret, we gain the ability to build more effective turrets with the new system, and get a purpose to the currently near-useless base segment of a turret.