It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

It seems if one wishes, one may buy dozens of the same turret, selectable missile or cannon, etc. The obvious application of this is actually when returning with salvage, such as if a well-equipped Raptor pilot finds redundant Air-to-Air Missiles lying about and wishes to have the space to carry them home for sale.
Even so, one -can- buy more. If one does so, is this represented by increased damage, durability if one's shields plunge to 0 and the ship is damaged, or is it just a way to waste cash?
This question / problem has been solved by DarrkPhoeniximage
Having multiples of the same weapon doesn't have any effect on damage, durability, etc. The second weapon is completely extraneous except for under one specific circumstance. If you get heavily damaged (as in only 10% of your total energy remaining) then there's a chance your active weapon will be destroyed. In such a case having a second of your active weapon can keep you in fighting shape as if nothing had happened, although I'm personally of the opinion that if you're getting that close to death then the cost of the second weapon would have been much better spent on an extra Phase Shield or two.