Dave, you know me better than that. My PH Twist gun letters as 3 1/2". While you are researching the beginning of the Super X 3 1/2" ten gauge ammunition, I will dig out the date of the #6 frame PH manufacture and verify the chamber length. If it says 3 1/2", and if we are skeptical, maybe Chuck Bishop will confirm. I will post the serial number.
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