An AK with a slidefire stock might suffice in a pinch.
I still have the 20” bbl I bought for my 870 in 1968 with all the rioting then. BTW, 2016 ain’t nothing like ‘68 (for now).
There could be an outbreak of intervehicular gunfire either BLM or defensive during the current violence. I practice firing from both inside & outside my vehicle, and both moving & stopped.
Vehicular jihad is also a possibility. On the highway, never let a vehicle pull alongside you in the left lane and just sit there.