12-gauge 2 5/8 inch shells were still quite common in North America upto WW-II. So, a customer might order a light 12-gauge specifically for the 2 5/8 inch shells, which with Parker Bros. policy of holding the chamber about 1/8 inch shorter than the intended cartridge, would give a 2 1/2 inch chamber.
I don't know about the Parker records, but I have noted the occasional 12-gauge Ansley H. Fox ordered chambered for the 2 5/8 inch shell. To date
I haven't come across one of these guns ordered for the 2 5/8 inch shell to measure the chambers.
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