Pretty much this. The shorter the barrel the better for home defense. I personally would put a few hundred rounds thru it (but the more the better) to make sure of the reliability.I bet you can find peace of mind in a nice lightly used 870/590 or similar with a front bead. Make sure it cycles, test fire it two dozen times to make sure it didn't fall off the truck. Then load it, lock it, leave it, and don't forget to aim if you have to use it.