Charlie, the pins are spring loaded and depress when the shell is in place. They cause no difficulty in loading or unloading.
I am not convinced that these gizmos are after-market add-ons. I have nothing to base this on but is seems to make little sense to put that kind of money in a gun for an extra that has so little apparent utility. Maybe is was a Parker prototype that somehow got in the market. Has anybody heard of a company that was doing this work in the late 1800s or in more modern times for that matter?
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