Did you ever wonder why Privateer's missions go from series 5 to 7 in the game's internal numerical sequencing? Series 6 was cut pretty late in the process... but now we've found an earlier version of the game's script that includes them! After finding the derelict, you take the gun to the ship dealer on New Detroit...
There a man named WILMER tells you that he can't install the gun because you need to talk to Roman Lynch again. Roman Lynch is the mob boss you last saw earlier in the game after he sent his henchman Miggs to murder you and steal your artifact.
Incidentally, this finally explains why there is a never used closeup background stored in the game for a conversation with the ship dealer!
Lynch runs this town and you can only get the gun installed if you fly a series of missions for him. The missions are especially immoral, attacking business rivals and civilians...
... and one of them is an attack on a luxury liner! I am betting that this is what the final Drayman asset was initially designed to be (since we know there was a WC1-style Drayman in earlier concept art).
The series ends with you pulling one over on Lynch: he forces you to give up the artifact... but this time you give it away willingly, revealing in the process that it's only half a map and that you already looted the treasure. Now you've got your Steltek gun!
The final series is also longer in this version! You go to help Reismann but his fleet is wiped out by the drone. You jump out and find... Kuhl (art reused in RF) with a Kilrathi fleet, which is also wiped out! One more jump and you meet the scout and dogfight the drone 1v1.