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I would guess that the true measurement of the right barrel, with a bore micrometer, not a brass gauge, will indicate the Parker Repro idea of an IC, and the left barrel has been drilled out, like many Repro owners choose to do. Repro chokes, like your IC, are notoriously tight, and may indicate a choke tighter than marked. My full choke 28 gauge barrels measure .039 choke, a good full choke in a 12 gauge gun.
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