My 16 gauge Reilly with a Scott Climax action (early 1886) has developed a problem. Occasionally when I shoot the right barrel, the gun unlocks very slightly. Left trigger will not pull (thank goodness) until I relook the barrels. Scott Climax actions are not easy. I'll ask David Trevallion for a recommendation but who else in the USA could take a look at it. It's become my favorite gun.
The Reilly was discussed here (with pictures):
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=557199&page=1