Mitch is repairing my favorite 16 gauge, a boxlock manufactured nearly 100 years ago by John Blanch in London and bought in marginal shape (read "affordable") in the Hamburg, PA Cabela's store.
In answer to Bird Dog's 28 ga. question, just as a 28 ga. throws a better pattern than a 20 ga., so also does a 16 ga. throw a better pattern than a 12 ga. It was not for nothing that they were called "Sweet 16s". The Sweet 16 in the picture weighs 5-1/8 pounds, and so can be carried comfortably by Yrs. Truly (an ol' guy) until the Lab has retrieved a limit!