There seems to be a bug in the weapon options for the constructor stations. I'll attach a screenshot:
The mouseover for the starguard cannon shows a C4 Cargo Scanner, and that's also what you'll receive when you click the cannon.
No idea if that changes if you bring 25 units of electronics, but as of now you get promised a gun and delivered a scanner.
-Blackthorne
The individual has always had to struggle to keep from being overwhelmed by the tribe.
If you try it, you will be lonely often, and sometimes frightened. But no price is too high to pay for the privilege of owning yourself.