Recessed hinge pin
Was the recessed hinge pin patented by PB, and if so, does anyone know the date the patent was issued. I am trying to pin down, as close as I can, the serial number range in which the changeover occurred. I posted a similar question last year and Brian Dudley responded that the changeover occurred during the 5000 serial number range. Does anyone have a non-recessed hinge pin gun in the low to mid 5000's, or a recessed gun in the mid to upper 5000's?
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