Quote:
Originally Posted by Jay Gardner
Someone correct me if I'm wrong but it's the top of the pin that holds the rib extension to the barrels. Take a close look at your Parkers - it's there. I have never seen a Parker that didn't have one but they usually blend in so well that they go un-noticed. The one on this gun probably shows up just because of wear.
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That "pin" is actually a machine screw with a stepped head. It threads into the area where the breech is silver soldered together.
The screw's head would have been left very high with the slot completely above the level of the rib. Then it would have been dressed down flush with the rib when finishing.