Johnny Dollar-
You might look up Lee Shaver in Lamar, MO. He is supposed to be one of 'the' experts on 1885's. I'm at work and it blocks my searches for gun stuff, but he has a website. I did some searching a while back and found many forums where guys were having trigger work done by him.
Lee is the main one with whom I'm familiar and would have customers send in the trigger group from their Browning vice shipping the entire rifle. As far as I know, he's never maintained a website.
Old Browning Trigger Thread