Well, even the A2 stock is attached with the same kind of tube so I don't think the result will be much different. Like I said, I have owned several so I know how they are constructed. I believe the AR would be the KING of CQB AND SHTF scenarios if it were not for the weakness of the receiver extension and the very thin amount of aluminum on the lower receiver at the top of the front receiver pin. In my mind those are it's weakest points. The AR is excellent in the hands of a trained team of professionals who can cover for each other and/or transition to secondary weapons if the weapon fails (which I admit is unlikely). But for SHTF scenarios, I'd rather have something that I am not going to disable because I fell on it the wrong way or something. I don't have a team of trained professionals to cover me and no armory to issue me another weapon. (Well, it depends on who you ask as to whether or not I have an armory.)
I like the M16 and I don't think the military should abandon it unless they are going to abandon the 5.56 round. I think it is an excellent weapon for a professional military. On the other hand, I think the AK is an excellent weapon for a conscript army or guerilla force because it can take the kind of severe punishment and neglect you could expect from those types.
As for the Mini-14, I think it is an excellent ranch rifle and truck gun. I owned one in the past and I have one currently. It has never had a malfunction of any kind with any ammo, including Wolf. I use only Ruger and PMI mags and they have all worked flawlessly. It is much more ergonomic than an AK. It really sucks in the accuracy department. Mine has the same accuracy as the AK I used to own. It has never been proven on any battlefield I know of, but does that really matter? I will be buying another one in the next year or so because I like them. And maybe a Mini-30 too. Also, if I have to beat somebody with it, I can club them till all the wood falls off and the rifle will still function with no wood. (not well, but all the part still work without the stock on.)
Forgive my long windedness, but I have been thinking alot about this very subject (AR vs AK vs Mini) for several weeks now and I still have not arrived at a conclusion. I guess there is no best answer. If there was, we would have all bought the All-In-One Wonder Rifle and have forgotten all about these three. That said, my SHTF rifle is an M1A.