Drew,
Thanks for the info! I've been talking care of this gun for 45+ years and never noticed the repair of the stock. Looks like it was pinned at some point, during its past life, on either side of the trigger guard. - see pictures. I will definitely have it checked out!
I'm also embarrassed to say I don't have a choke gauge, but will pick one up to check each barrel.
As far as the barrels go, they look so similar to me, other than the 3" Mag marking and #2 stamped on the forend lug of the 28" barrel.
As a side note, I had to look at a 20 gauge field grade I have to understand what a barrel loop reinforcing wedge was - LOL
I will post more once I receive the research letter.
Thanks again!
Chris