Before embarking on this, I want to be honest and up front. I did not come up with this, and it is not a Matson original. I read it on a prepper blog about three or four years ago, and despite my GoogleFoo, I am unable to find it. Please, if you find the original author, leave the link in the comments so that I can give proper credit.
The rule itself is simple:
When traveling by vehicle more than one hundred miles from your home AO, you must have a long gun.
It doesn’t matter what that long gun is, just have one. Whether it is a .22lr, a pump 12 gauge, or a SBR AR15 is really unimportant. What is critical is that you have it in your vehicle and have an intimate knowledge of how to properly use it.
I have successfully, and repeatedly hit soda cans at 100 to 125 yards with this little Sub2000 in 9mm. While that is not a rifle round at rifle velocities, it is a very long reach and extremely high capacity (notice the eeeevil 30 rounders) weapon in a very, very small package.
Keep this rule in mind the next time you fire up the minivan for a trip to grandmas.