Time to get Google and your phone together. The trigger bar, as well as other "stuff inside" is likely very available through Magnum Research, TriStar, Tanfoglio, Cajun Gun Works, CZ Custom etc.. To be sure of a good match I would have my serial number and exact model handy and start calling after perusing their website. For example I have a TriStar T100 and the exploded view of yours and mine are the same diagram.
Before you put it in polish it (or at least smooth it) especially on the outside edges and the ends where slide rides...you will notice an improvement. Then as long as you have the trigger out ..... well you know....
Good luck, you should not need it, but good luck anyway.