Yeah, but have you ever tried to convince someone who works at a gun store that a private company in Geneseo, Illinois IS NOT the same thing as a long defunct government arsenal in Springfield, Massachusetts that closed 6 years before the private company started? I got into that conversation while talking to a couple "experts" working at Gander Mountain about whether the government ever made "tanker" model Garands. They can find them listed in a book as being made by Springfield Armory, Inc. and think they were government contracts for Uncle Sam.
Gander Mountain is just another box store, just like Wally World or Sears. One would think they would get it, but guns are so little of their inventory anymore that I would expect any one clerk to know more about their clothing line than a gun type - or origin. The one here recently moved their powder/primer cage off the main floor and into a "safe" back area, ostensibly due to a "safety" inspection. So now you have to ask them for a specific brand/model and they will go fetch it for you, rather than being able to look through the shelves in the cage and get it yourself.
One fo the other box stores here (we have 3! plus a locally owned Mom & Pop) - Sportsman's - does have the S&W M&P offer on the counter at the gun section. Nice feel to the firearm, and tons of gear - basically the pistol, 4 mags, 2 mag holders, a holster and carrying case all in one deal for $100 less than the Sig 250 I went in to look at (no .45ACP in stock though). Unfortunately, I have property taxes coming due next month, so no-go on the deal. But it looks like a good one.