I believe they are overpowered.. when mixed with drones++ and the rail corner mod (forgot its actual Name)
I present
Shadow: Mercy (But you won't get any mercy..)
Target: around 525 long block (Couldn't tell.. it lagged meh computer..)
(This ship itself IS a railgun. Not complete)
(I added armor bands later on)
In the end, It went through 70 blocks, (17 armor)
Vs Ship.
(Two Crescent Wraths)
(if you can't see, It split both ships in half)