FWIW. While it's been over 8 years, I spoke with a local former gunshop owner and gunsmith who sold both Browning and Beretta O/U shotguns. As for Beretta vs. Browning, he recommended the Beretta as he saw fewer problems or customer complaints over the years compared with the Brownings. When a Beretta had issues, parts were readily available. Browning Citoris were another story. Despite a higher frequency of repairs he experienced, parts were difficult to obtain from Browning. Maybe that's been rectified since then. Here's a review of the 686 including a stripping down of action and ejectors all done with simple tools or fingers.
https://www.youtube.com/watch?v=ekjbgWBecgg&t=1212s