My second last trip to WSS involved me fondling a tactical express, and a mossberg 590-a1. I went home with the 590-a1. I'm so far pleased with that decision. I already own an 870 Super Mag and a DA 8.5" griz. I think the 590-a1 would make an excellent choice for the TEOTWAWKI. To be fair, they are all very reliable, wonderful firearms, but that would be my choice. I haven't even fired it yet, and the action is already smoother than both the other two, the Super Mag has roughly 500 rounds, the Griz is around 100.