I don't understand why the authors started the vent rib numbers at 222,930 range when the stock books were generally available for study from the beginning of vent rib availability at the 204,000 range up to serial number 219857. There were probably lots of vent rib guns earlier than the numbers they chose to list. They only came up with four to mention in the Skeet and Trap Gun section of the book. That four guns were probably actually taken from the stock books and not extrapolated. I think their information is incorrect because of an oversight, not because the stock books were not available for study. There were probably quite a few P Grade traps from the 204,000 range to #222,930 where they started their listing. I have no idea why they were left out of the listing. My gun is in the stock book, but not in the TPS list.
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