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Back in the day, I too had a rifle in the truck at all times, especially during deer season. In the fall, just about every pickup truck at the high school would have a full gun rack in the back window.

Speaking of which, I think you would best be served by getting one of those cheap rear window gun racks. Academy has them for under 10 bucks. You can also get models that allow locking the gun in place. Just make sure the forks are such that the rifle is stuck and can't bounce. This makes it less likely to go flying when that fateful day comes when you "Roll Yer Truck".

As far as it being an AR, I probably would opt for something in the lever action family. For no other reason but that they can take more abuse and the 30-30 has a bit mor punch than the .223.

But of course, we must carry the gun we have.