An M-79 with a flechette round would also be quite useful for navigating crowded shopping malls. It's the nice big bore that does it...a lot more physical presence than your wimpy Uzi, especially if you prefer the 10" one. Black powder cannon are great for celebrations, but grapeshot or canister works much better than ball on your REALLY difficult targets, like conservatives and "right-to-keep-and-bare-machine-guns" fanatics.