So far as I understood it, Parkers chambered for 3" shells at the factory are easily distinguished as such vs. essentially larger framed (e.g. 2 and 3-framed guns) 12 ga. guns whose chambers were lengthened after market to accept 3" shells; if you lay as straightedge along the FULL LENGTH of an original factory 3" chambered gun, there is no "swamp" or taper to the barrels, they are straight along the full length of the barrel. Guns bored after market show a decided taper or "dip" to the parallel line from breech to muzzle. And as the case with Fox HE grade guns, most were marked "3 " but not all of them.
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