Richard,
The Parker Story lists that a size 0 frame is 1" between the firing pins. Those were provided on 16 and 20 gauge guns. Presently the 16's seem to be in very high demand and thus command a high price. The 20's do not lag behind the 16's by much. I have a DHE 20 and would pay good money for another set of barrels. I would pay a lot more for a set of 16 gauge barrels that could be fitted to my 0 frame.
I provided the above to let you know what you are up against. There are probably a few hundred other Parker collectors that would be as or more agressive than me in finding extra barrels. "With a double gun one is buying the barrels."
Please keep the remains of your father's gun. It might be good to consider purchasing a relatively low cost ($800 to $1600) V Grade 12 gauge and enjoy that in memory of your father!
Respectfully,
Mark
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