Well, not legally.
My use of Traveller setting and dress falls under
Possession of a quad turret without Imperial authorization is a felony that will result in confiscation of the turret (weapons mounted will not be returned), a fine of 2d6 x 100,000 credits, and loss of captain's license. Seizure of ship and jail time of 2d6 years is also possible, depending upon the severity of the situation -- a captain with no record of legal trouble and using the quad turret for self-defense will receive more leniency than a pirate.
Quad turrets are TL10, displace one dton, and cost 2 MCr. to governments; illegally obtained ones can cost 2-3 times this.
Ship Software is another area the Navy tightly controls in order to maintain its supremacy. Unlike quad turrets, however, computer programs are not discernible to via casual inspection, and so are more rampant upon the black market. It is, however, rumored that these illicit versions are compromised in some way; perhaps they are riddled with viruses, or contain subroutines that allow certain parties (such as, oh I don't know, perhaps the Imperial Navy) to issue a shutdown sequence using a coded frequency, or are memory hogs that prevent other programs from running. Illegally obtained versions which are both clean and fully functioning cost at least double the legal price.
- Evade/4: TL15, Rating 30, Cost 5 MCr.
- Fire Control/6: TL14, Rating 30, Cost 15 MCr. (This is due to be declassified soon.)
- Fire Control/7: TL15, Rating 35, Cost 20 MCr.
- Auto-Repair/3: TL14, Rating 30, Cost 20 MCr.
Possession of restricted programs without Imperial authorization is a felony that will result in confiscation or erasure of the ship's computer and a fine of 2d6 x 10,000 credits per infraction.
Next week: Datacasters