It appears to be a nice shotgun and you seem to be taking the steps to make it a keeper.Benelli hammer/trigger/disconnector installed along with the Wolff FCG springs. Some grinding/tweaking was required for fitting but all is well now.
24 rds fired without issue.
Now, please tell us more about the revolver, at least caliber and bbl. length. Maybe a pic if you like. Starting the thread like that is like the salad before the steak gets there.
Edit: oops just saw this is long guns sub for. Maybe you could post in the handguns sub for.