I'm currently in the market for a home defense shotgun. I am set for the most part on the Mossberg 590A1, but I'm curious if it can be used for a bird gun too. Can I swap barrels on this model? I know some have interchangeable barrels and I'd like a longer one for hunting birds. If a barrel swap is attainable with this gun, then it's a for sure buy for me. If not, could someone recommend a nice home defense/field gun? I looked at the 500, but I like the speed feed ability and the 9 shell capability of the 590A1. Thank you.