A little information on weapons.
Master controls the weapon type, slave modifies features of the weapon, while effect blocks give the weapon different attributes. Missile weapons are the most drastically changed when given a slave system.
For reference I am going to use Master + slave = weapon type description.
D1000 alone = slow firing rocket.
D1000 + D1000 = Swarm firing heat seeking missiles. An indiscriminate weapon that won't attack the mothership/motherstation but anything and everything around it, the weapon LOVES overheating cores (ignoring nearby craft and going straight for the overheated core) and is a great 1 VS fighters weapon.
D1000 + Cannon = Rapid fire rockets. Each individual rocket's energy consumption and damage is low but the DPS is good. I have yet give this weapon a good testing, it is not my preferred weapon.
D1000 + Damage beam= Lock-on missile with increased range. A surprisingly good weapon when used with an AI turret.
D1000 + Damage Pulse = Lock-on Torpedo with increased damage, AOE, reload time, and energy consumption. If you can power this weapon and get a hit, expect the enemy ship to feel the damage. Unfortunately the reload time is just as excessive as the weapon's damage and energy consumption. (Do not let the AI get its hands on this weapon combination, you will regret it fast.)
NOTES: With the current build damage beam and damage pulse turrets damage the mothership if the beam or pulse hits the ship. The AI is also a cheating ******* because the AI has the ability to switch the master and slave combinations around once the cool-down has ended. In other words with a D1000 and Damage pulse combo, both the D1000 + Damage pulse and the Damage pulse +D1000 combinations will be used with one system.