I'm an apologist for S&W semi-auto handguns. As a kid I burned up large amounts of corrosive WW2 surplus ammo through an early Model 39 that my dad bought used for $40. I didn't know these pistols had problems until I read it in a gun magazine. Before UPS and FED EX ammo was shipped by rail. The guy at the Express Office would call you to pick it up. Nobody cared that a skinny 14 year old showed up to claim the box.
When I had my 2.0, I had a Williams adjustable on mine. Worked just fine.
https://shop.williamsgunsight.com/ec...etition-070962
"... And miles to go before I sleep".
I think it's just Cerakote. I have two of the FDE M&P pistols, and both of them showed wear spots very shortly after I started doing dry fire with presentation from a kydex holster. My black colored M&P pistols with significantly more use and holster presentations show almost no wear.
I'm about to have a 5" slide cut for an optic and then refinished, and i'll probably go with a nitride finish instead of keeping the Cerakote.
Adding nothing to the conversation since 2015....