Put yourself in this guy's shoes:
OK, you own a storefront business in a central business district in a major city. The area was once middle class but has gone downhill recently. Your business is your life, you have one Daughter in an Ivy League U ($$$) and the other Daughter's husband (With three young kids)is your employee, as is your Brother in law and two cousins (Twelve kids between them). The depend on your business acumen to earn a living. Lose your business you and your family are toast.
The natives are restless over a perceived injustice, and start to riot. You need to protect your life's work but you are not a gun person and the Police cannot help you. You go to one of your customers for advice, you have absolutely no time to "Get Training" but you did do a stint in the guard during 'Nam so guns are not unknown, you just do not have the time to "Train" with some expert.
If you are the customer whose advice the store owner seeks, what guns would you recommend to the businessman and why? Handguns are NOT an option due to laws etc.