These don't "shoot loose":
The gun on the bottom was produced in 1946. It is on it's second buttstock, has suffered two pimple bulges it the left barrel, a huge backbore and relief of the chokes in both barrels, and was used hard, by the former owner, one Steve Bodio, and harder by me in the two decades I've owned it.
There is no pin to wear in the design, and a spring loaded cam holds the action closed, and will compensate for any wear that occurs, although the wear surfaces in the design are enormous, and don't really allow for a lot of wear.
The barrels measure .090 in the area of the bulges, and, while technically out of proof, the maker assured me it would be fine to use as it, just not to let anything obstruct the bore.
You guys and your hinge pins...
Best,
Ted
