That particular M70 was made exclusively for Walmart, as were several other firearms model variations from other manufacturers. When that M70 synthetic first appeared in Walmarts, there were many mentions of it on the internet, as some didn't notice it wasn't actually a Black Shadow until they looked closer.
A couple years ago I came aross a new M700 ADL with a laminated stock, matte-finished metal, at our local Wally's and was told that model was exclusive to Walmart too.
Don't know if it's still the same, but for years Walmart was the only place one could buy the Weatherby Vanguard (Howa) as well.
In one of your earlier posts, you referred to the Rem. M710 as being made for Walmart, but you also saw them at Dick's.
No such connection to Walmart, as that POS is available at any gunshop and always was. It was Remington's sorry answer to inexpensive rifles such as Savage sells and can't hold a candle to a Savage, in my opinion.
I have never bought a firearm at Wally's, but will say that the one closest to me has an impressive variety of green box Rem. ammo in stock, at decent prices. What little factory ammo I purchase though, generally comes from a local small shop.
Do occasionally pick up a few boxes of sale-priced 30-06 ammo for a relative, from places like Walmart, Dick's or Gander Mtn. He tends to my hunting camp that's in his neck of the woods, I buy the ammo he likes. It's a good deal for both of us.