Mossberg is it a 12g or 20g? I found that the ammo for the 20g was harder to find but 12 g was all over the place, everyone had it. I have a Remington 870 that I just updated it with the ATI so I have two. I thing that in an SHTF 80% will be close shots so a good shotgun will help. My FAL .308 will be for the long shots and hunting.