Ooops, there I go relying on my memory again. I'm sure, then, that it must be a sixteen. In any case, the 18 ga. barrels are the set that was made made for the gun by Parker Bros at the request of the ammo manufacturer that the gun was sent to for testing the 18 ga. ammo they tentatively would (or would not) produce. The gun was not originally made as a 18 ga.
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