Page 527 of The Parker Story gives the exact specifications of each size of Parker frame. Firing pin separation is one important limiting factor in the fitting of one size of Parker barrels to a matching or non matching frame size. Notice I said "one limiting factor", not the only one. The pin separation of #1/2 and #1 frames is the same. Also, the pin separation of #1 1/2 and #2 frames is the same. I have a set of #1 barrels on a #1/2 frame gun and things look pretty good. I have never tried the #1 1/2 to #2 conversion, but that might work too.
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