I'm looking at buying my first shotgun. I really want one that i can use for hunting as well as home defense. I've been looking for a couple months now. Im looking at a 12 GA Remington 870 Express HD with an 18.5" barrel, 6 round... or a Mossberg 500 tactical with a 26" barrel, 8 round. Hunting deer and small game. I would like to be able to change out barrels for whatever i intend to do. Advice would be great!