Ok, I know its probably been asked but I am looking for my first shotgun. Mainly for a home defense and general shooting use. I am looking at the Remmington 870 or the Mossberg 500. Can anyone tell me which may be better, advantages / disadvantages, etc? I know police swear by Remmington 870s and the US Military use Mossbergs. I know the difference in that Remmingtons have single extractors and Mossbergs have duals. Can anyone help me out? Thanks!