I have not had my hands on one from WalMart, but I would expect them to be exactly the same as one from a LGS. Colt makes a Tier 1 AR period. There are others as good, some even better, but they are what the standard is. If you buy a Colt, know that unless you get a lemon(there are lemons in ALL brands) it is a great duty quality rifle. I doubt Colt will let a "lesser" quality rifle go out the doors, no matter to which company.
" The strongest reason for the people to retain the right to
keep and bear arms is, as a last resort, to protect
themselves against tyranny in Government...." - Thomas Jefferson