Manufacturer's don't lower the quality to sell at Walmart.
I beg to differ, find a Wal-Mart with a Marlin 336 and find a local gun store with a new 336, you can tell a huge difference in the quality, texture and finish of the wood and how deep the metal finish has been blued.
Wal-Mart sells AR's... SO WHAT! Does the guy/gal behind the counter know anything about them? Can they answer your questions about after market accessories, or show you how to disassemble it, or show you how to lighten the trigger pull?