Seriously, my very good gun buddy and FFL drove me to the endoscopy. No big deal there. Then he tells me that Jackson Armory in Snider Plaza (you can look it up; URL is not permitted) has a Smith & Wesson I have to see. EEK! I'm really not buying guns much but, okay, make me go see it.
If I understand what I am seeing and what page 487 of the 4th Edition of the SCSW is telling me, and the gun store guy, I have a five screw M&P that, because the butt has an S on the far left side and then 874221 way to the right, was sent to the factory for a "S"afety modification.
I'd love details on that modification.
Then my buddy shows me a gorgeous Model 15, priced around $675. I couldn't get motivated, I wasn't looking for a thousand dollar day. The M&P was $325 TTL/OTD. I think I did okay there!