First off, the full serial would be helpful for us to know so that maybe those who track numbers in more detail may be able to check their records.
Some information on 40" parker barrels. 40" was the longest barrel length that Parker offered. And the few that I have seen actually measured 40.5". so that may be where you're conflicting information of 40" and 41" comes from. Some rounded up and some rounded down.
And the few 40" guns that I have seen had unmated ribs as I suspect that the matting machine was not able to matte up to 40" length.
I would bet the gun was built on a 6 frame.
Best of luck on your endeavor.
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B. Dudley
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