Greg, my 28" 20 ga Q1 & Q2 barrels are identical to yours and have none of those proof marks that the GI gun displays. Of course the GI gun is an early "P" repro and those were a 'horse of a different feather' so to speak, with certain attributes all their own. My 20 ga. Repro is 20-3524 and is a two-barrel set, 26" and 28" with both barrel sets Q1 & Q2.
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