I recommend a Browning A-5 shotgun.
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Too low a rate of fire, too few rounds. Good in the olden days, but for today’s looter crowds of 10 or 20, something sterner is required.
May I humbly suggest a GAU-19/a? With a rate of fire that is selectable to be either 1,000 or 2,000 rounds per minute, it is more than enough to quell the large crowds of today and work well into the future should looting crowds increase in size.
Have you got an extra one I could buy? My local Cabelas seems out of those.