I'm looking into getting a shotgun for hunting/skeet shooting and for home defense. I was looking into the Rem 870 18" but I heard that you want a longer barrel for skeet shooting and I'm assuming the same for hunting. I'd really prefer an 18" barrel over something like 26-28" so I was looking at the Mossberg 500 combo that gives you an 18.5" and 28" barrel. Opinions on the Mossberg? Also, is it true I want a longer barrel for skeet/hunting? Thanks for any help.