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The 28" IC/MOD 2 3/4" and 3" marked barrels of my 2 barrel set measure .734 bore in both barrels, from 3 1/2 to 2" from muzzle taper .002" and total constriction is .008 and .012. 26" barrels are Q1/Q2 and marked for 2 3/4". Not a SSS serial number.
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