[mapsjanhere]

Well, for a SHTF situations, why would you think you need good long range capabilities? Unless you're living in open farmland, where your only SHFT is loss of NASCAR and NFL on TV, your enemies will probably have enough cover to approach you to 100 yards before you can effectively engage them. At this point, the ability to put multiple shots on multiple targets will greatly favor the AR type.
And if you're defending that quaint little Mad Max homestead, your enemies most likely have a 82 mm mortar from the next NG armory to clobber you from past rifle range.
As for the tactics vs. logistics debate, that stems from a time when you were moving half a million soldiers around a map, not when the supply of cold carbonated beverages in remote outposts was outsourced to KBR.