Replacement/extra set of barrels added later. Folks on the factory floor doing things the folks in the office hadn't caught up with. Cut camouflaged. A PGCA letter may tell. A good picture of the barrel flats may show a clue.
The Trojan table, page 246 of The Parker Story shows 1,695 26-inch barrel and 3,758 28-inch barrel 20-gauge Trojans. They don't show Murphy's 30-inch 20-gauge gun but do show 3 30-inch 16-gauges.
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