The SHTF gun means many things to many people. Having actually taken incoming fire and proven I cannot stop a bullet, I have a different idea than the casually interested. Planning for an apocalyptic nightmare seems a popular pastime—especially for cinematic writers. Just the same there are times when the need may be real.Perhaps the Remington 870DM should be at the top of the list in SHTF shotguns. Man’s propensity for savagery, slavery, and mayhem has little diminished since Neolithic times. Geopolitical woes, revolution, disease, and natural disaster are real concerns. I am not one looking forward to such a...