The rumor that Walmart sells substandard or "factory second" guns has been around forever.
The fact is, as reported by posters on other forums who WORK for Walmart in the gun departments, local Walmart stores order their guns from the same big distributors the local gun dealer orders them from.
Walmart, like a lot of department stores like Sears, Wards, and Western Auto used to do, sometimes have a special run of guns made specifically for them. These are just standard models with something custom for the store like a different barrel length or a different stock.
These are ordered by Walmart corporation in Arkansas and shipped to the stores. As example a friend of mine bought a Walmart-only model of the Ruger 10/22, which was stainless, with a longer barrel, and a gray laminated stock.
No gun company can afford to run two production lines, one to make good guns and one to make substandard guns for department stores to sell.
In addition, the liability for a substandard gun would have the company and Walmart sued out of business ASAP.
For standard model guns like the Colt LE6920, Walmart local stores just order them from a big distributor just like everyone else.
Last, what gun company, especially Colt would want it known they make lesser quality guns for someone.
The LE6920 you can buy at Walmart is the same rifle you'd get from the local gun store or anywhere else.