Since I live so close to the Peoples Republik of Maryland, I am about equidistant from the Walmart in WV (30 min drive) and the one in Md (about (25 min drive).
There is quite a difference in the type of guns that they sell. In Md it is mostly hunting type rifles and shotguns. In WV they have several "service" type rifles, Sig 556, Bushmaster, etc. They also have M4 looking .22 cal in WV and Md doesn't.
They will occasionally have the military surplus 5.56 mm 62 gr in the ammo box (several hundred rounds) in WV but I have never seen it in Md - only small boxes of 20.