By an overwhelming majority; the AR-15 has become America’s go to rifle when it comes to post apocalyptic considerations. The AR-15 has proven itself to be reliable, versitile, easy to maintain, lightweight, and the .556 Nato and or .223 Rem are effective rounds for the distances and scenarios which they are commonly used for.
Currently this ammunition is sold throughout the United States and can generally be found or scrounged up when needed. Of course the wise prepper doesn’t wait until the last minute to do so. So for post apocalyptic applications; the AR-15 should be a primary consideration for defensive survival applications.
Remember avoiding trouble, lying low, blending in, not appearing to be an easy target, and not looking for confrontations is always a prudent survival policy. In a post apocalyptic world there will not be assistance from law enforcement, which will likely be non-existant, so you will need to rely on yourself, your skills and your capabilities in order to survive.
You can see all 5 of my post apocalyptic fiction books, 2 of my zombie fiction books and 1 of my horror fiction books on the left side of my blog page. Go ahead and purchase one or more over at Amazon.com. They are really quite interesting and entertaining to read.