There are lots of .22 rimfire rifles that breakdown, more or less, easily. Many of the older .22 rimfire .22 rifles use a knurled stock bolt, under the action, to hold everything together and to act as a take down bolt. Just unscrew it , and the rifle breaks down into two easy components. Put it in a slightly padded container, and you have a nice car/survival gun.
You can do Marlin 60 type actions this way, but the trigger stays with the stock. They are common, cheap, and work well.
I fully appreciate there are numerous rifles besides the AR-7 that can fulfill the same purpose. However, I was addressing the reliability issues (feeding and jamming). These problems were associated with certain manufacturers of the AR-7. Henry Repeating Arms has gotten all the reliability bugs out of the AR-7, so I’d buy one if I was considering a cheap survival rifle.