Walmart is well known for demanding that the companies with which it does business cut unit cost as far as possible, and that frequently involves lower standards of finish, swapping out more expensive parts made of metal with plastic, lower quality wood, etc.
No different than the big box home improvement stores, like Home Depot.
I remember many years ago when HD was just coming up...
I used to have crews framing homes, and had a framing nailer take a crap. Nothing unusual about that, but I was under the "gun" (sorry...), every other one was in use and no time to get it repaired so I needed a new one, quick.
Rather than go to my usual tool supplier, I went to HD instead since they were closer.
Went down the aisle, and there was the same Bostitch gun that I had at least a half dozen others, of. Good price, snatched it up and ran back to the jobsite with it.
Some time later, it needed a re-build (as they all do), and took it in for repair.
My tool guy looked at it, and said "Home Depot gun"...and I said "So what? It's the same as the others".
"Nope" he said. "Looks the same, same model number. But Bostitch makes these specifically for Home Depot, and there are NO REPLACEMENT PARTS available for it."
That's when I began to learn that DeWalt, wasn't the same DeWalt...Bosch wasn't the same Bosch... In fact, none of the high-quality, made-in-America brands that I'd come to know would ever be the same anymore.
Rant over...back O.T.