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I don't know the significance of the "F" and the "I".
I just checked my two 28 ga. Repros and don't find such a marking. My serial numbers are 28-3033 for the IMP & MOD barrels and 28-3961 for the Q1 & Q2 barrels - if production range might have some bearing on the markings.
The Following User Says Thank You to Dean Romig For Your Post:
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