Okay, just got back from the store.
Short story
Good news: They did an even trade for another actual Model 10.
Bad news: They likely just lost a customer for life and therefore I lost access to the LGS with the most selection and best prices.
Long story
I approached one of the owners (a woman, probably 50's) and gave her the gist of my complaint. She says "Oh, that's definitely a Model 10 hun". I tell her what I had found out upon further research and the unimanimous feedback I received here (i.e. this gun is NOT technically a Model 10 AND it has been refinished AND it has been rechambered). She scoffs and says "Let's ask my gunsmith". Oh, and BTW she refused to believe it had been rechambered even though any experienced gun person could easily tell by the barrel markings. She just goes "It says Special right there" which really had me really questioning her competency anyway.
Surprise surprise the gunsmith backs her up. He says this is in fact a Model 10. He says "M&P's are Model 10's. It's the same exact thing." I tell him that while they certainly look the same I had been told by "experts"
that modern Model 10 parts would not fit my gun and that was my main concern. He says "Oh no that's not true. Model 10 parts will definitely fit this gun. It is a Model 10 after all." I bring up the short action/long action thing. I bring up the fact that the serial number dates it to the early 40's. I bring up that it has clearly been rechambered to .38 special. All I get is "It's a Model 10".
Whatever man. I don't really know what to do/say at this point. I just tell them I'd really be more comfortable if I could trade it in on a similarly priced Model 10. After all I had only purchased it two days ago and never even fired it. So after a lot of hemming and hawing, she agrees. And she makes zero effort to mask her anger about it.
After I have picked out the gun I'd like to trade for she makes no hurry to help me. I stand there a good 5-10 minutes before she gives me any attention. She then has me fill out the necessary paper work then leaves me standing there for literally 15 minutes. I know. I was looking at my watch the whole time. She finally came back then left two more times to help other customers (there were 2 other employees behind the counter who she could have easily told to handle the other customers).
Here's the kicker. The moment when I decided I won't be giving this place another dime of my money. As she is filling out the paperwork another employee (who sold the first gun to me and was extremely nice) comes by and says "You trading?" and the owner interjects "Yeah. He's got a lot to learn about Smith & Wessons."
Which, to be fair, is true. But I mean, how freaking condescending and rude. I give her a death stare but otherwise bite my tongue. I would've liked to tell her that she herself has a lot to learn about S&W as well.
I'm a small business owner myself and I would never treat a customer like that. Just totally uncalled for. But oh well. I hope her little tantrum was worth a lifelong customer. I'm already eying my next gun and I sure as heck won't be buying it there.