Continuing my contrarian mood: What is so attractive about a mechanically complex and environmentally sensitive high velocity .22?
Not sure what is complex, ARs seem a pretty basic and reliable platform...and not sure about the ennviro-sensitive issue is, lead?
Anyway, like JF pointed out for my first AR I wanted something with common ammo, if the SHTF sooner rather than later I wanted something that shot an easily obtained/bartered caliber. Getting a larger caliber system costs more in an AR platform, which I guess why many go the AK route. And I did get a piston system which is cleaner running. For general zombie suppression it is sufficient, if I want more knock down power there is the 30-30 and the 12g's pumping out buckshot and slugs.
Thanks for the additional links guys.