Skeet's Gun Shop in Tahlequah,OK did mine several years ago and its still going strong. Dean Harris is the gunsmith and does not mind phone calls. Make sure the trigger can be converted back to pull easily and with no adverse pull or creep problems in the pull mode. Very resonable and a pleasure to deal with.
I always have Darrell Johnson at Spears Gun Shop do any trigger work on my Brownings. He is the best by far in my opinion (whatever that's worth. His contact info is:
207 N. Main
Abbyville, KS 67510