Oh, it's you? I have something special for you today. There this bastard, folks call him Reshala. This moron with the gang of his has been there for a while - robbing and killing people. Kill him, and get his gun as proof. It will be a good match for the Mechanics collection.
The golden TT must be functional, but does not need to contain all of its original parts, so you can swap the barrel and grips (these must also be found in raid) out for cheaper alternatives before handing it in.