I mic'ed the chambers, and they are dead-on 12 gauge, so we might have a mystery here. Plus, I've been shooting this gun for over 30 years with 12 g ammo, and have reloaded the empties with no signs of oversized chambers.
The bores are certainly oversized for a 12, and the chokes are a very long taper in both barrels.
I suspect that this was a pigeon gun, so there's no telling what interior mods might have been done over the years.
BTW, this gun patterns nicely, and kills pigeons in the ring with authority!
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Threaded Mode