It depends on what vintage the Pigeon Grade is........the barrel shoulders are cut different on the older Pigeons....hence the foreend iron is different and the later DG barrel will not accept the Pigeon FE. Late production Pigeons are the same. As to interchangeability.......my top single will accept my unsingles barrel but the unsingle will not fit my O/U's reciever....O/U tubes won't fit either singles ....it's a roll of the dice.
Jim101, And that can be off on a shotgun as well right? Requiring fitting? I had checked into getting a additional barrel for my top single gun and I was told that it may need some fitting or headspace work.
Slugger, I see what your saying, I always thought that as well until I started looking into having a barrel fitted to my action, unless the person I got my info from is way off topic? I suppose maybe he was just speaking of a secure lock up, but he mentioned the head space.