Thanks for all your replies. Jim, if the gismos were installed to help retain the shell in the chamber, your fence-crossing explanation has some merit. It would seem however that this add on would not likely be something one would install in a gun choked full and full. Maybe the research letter will offer an explanation.
Somebody like Del Grego may be able to offer an opinion. He has seen and worked on a mountain of Parkers over the years. Anybody else have any ideas?
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