Newest Model 12 in the house in 20 Ga. Not the real deal but a Browing repo. If I didn't know I would think it was an original. Had a feeding hiccup, but the brother of a friend who knows Model 12s fixed it. Should be a great Grouse gun.
Battue had it right. Model 12 in 16 gauge. I have owned Remington 870's, Ithaca, and Browning. I would go with the Winchester, but any of them will work OK.
I'll echo a couple prior comments and vote for the one my granddad gave me...a 16 ga Model 12. It does swing and mount for me really well. Seems to shoot itself. And there's something poetic about a one ounce load in a 16 ga barrel.
What part of "shall not be infringed" do you not understand?