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I believe it was intended to be a different nomenclature for the same thing.
The constriction of my 20 and 28-ga. Q1/Q2 choked Parker Repro barrels correspond to the SK1/SK2 constrictions of virtually all of the manufacturers choke charts that I've seen. I have not measured a .410, 16 or 12-ga. Repro's Q1/Q2 chokes to know if that holds true for them, too; but I suspect it does.
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