Most NID 28's have 26" barrels from my observation although I know where 2 are with 28" barrels.
I've never encountered any 32" NID 28 gauges and never a 30", except the NID being offered by CSMC as a 2 barrel set, 26" 410 & 30" 28 gauge. The 30" 28 gauge barrels do look like Ithaca assembled barrels by the markings but there's also some features that definitely are questionable.
I would definitely see them as having been added at some point and not very well done.
|