Dean, we have discussed this over and over, both on the phone and here. You know the center to center dimension of the early SMALL framed hammer 20s was 29/32", 1/32" smaller than the finally adopted 00 frame, or 1/64" Difference between the actual firing pin of a true 00 framed gun, and the center of the chamber of the early SMALL frame 20s. However, what matters equally is that the width across the bolsters is the same, as is the height of the breech face, from water table to top of bolster.
I typed SMALL all in capitols, because the first several 20 gauge guns were a mix of 1 frame, and the frame eventually adopted as 00 in hammerless guns.
In making many of these early 20ga. guns with such a small frame, Parker Brothers must have had a very good reason, however, it's anyone's guess what it was.
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