Remington doesn't make custom orders, eh?
Ever see a Sam Walton Commemorative 11-87? Its a premier grade 11-87 with gold (plated) embellishments and his signiture engraved on the receiver. They made 1100s in a similar fashion. Wal-Mart only, ordered by Lipsey's.
Or WalMart-edition Ruger pieces such as the 10/22 Carbine with gray laminated stock and the BBZ model Mini-14. Run "Sam Walton" or "Wal-Mart" on the Gunsamerica search engine and you will see what I'm talking about.
Make your order large enough, and manufacturers will make whatever you want. Just ask owners of those Lew Horton exclusive Ruger or S&W's.
As for the Beretta 390s
Check out this article.
http://www.shotgunreport.com/SR_Pairs/20-Jan-02.html
Or how about Weatherby Vangard rifles?
http://www.weatherby.com/support/faq.shtml#2
The Plain Jane Push-feed Winchester 70's with blind magazines are also a Wal-Mart specials with notoriously bad records.
I still advance the theory that some manufacturers put together bottom basement models as Wal-Mart exclusives. But that is not wholly responsible for the sorry condition of firearms found at many Wal-mart chains. Employee neglect, as Guyon mentions, is certainly a factor. The guns are roughly treated by most employees during transit or inventory, never maintained and often displayed incorrectly which results in damage.
Also consider the possibilty that the in their effort to cut costs, Walmart might accept guns from their sources (both direct and Lipsey's) that are factory reconditioned, cosmetically flawed, or "new" old stock that has sat too long in some sweltering warehouse.
There were certainly good guns for good prices, even among my former store's motley collection of beaters. The guns with outwardly obvious defects usually don't make it past the log in process, so customers don't even get to see the real dogs that Wal-Mart receives, let alone purchase them. But those with more subtle defects, or missing internal parts might make it out on the shelf. Shoppers should inspect each one carefully before purchase, and weigh Wal-Mart's low price vs their unspeakably bad customer service/return policy.