That is now your * Homeland Defense* weapon, as mine has been since 09/11 of last year. Neither does it hurt to have a shotgun along for a spare, should a less-well armed cop or bystander be worth arming to cover your back, or in the event that hostilities commence in the dark at closer ranges than favour the use of some rifles.
In my case, the shotgun was the more usual vehicular accessory, along with my personally-carried handgun. But now both are aboard should they prove handy to have around, as they have three times for me before.
-archy-/-