(I originally asked this in the M&P sub-forum, but got nothing but dozens of views, so maybe this sub-forum will yield better results.......or
any results !
)
I have one of the newer M&P 9L's that were re-issued (for LEO's as I understand) a few years after the 2011 discontinuing of this model. It has the little square tabs filling in the holes where the thumb safety would go (in fact, I just noticed that one of them is missing).
Information is kind of sparce, but I've read that this has been done before, with others claiming it can't be done. I'm also reading the S&W is less than cooperative in this, for possible legal reasons, but I may give their tech department a call on Monday and hope to get some solid info.
There's a company (Speed Shooter Specialties) that sells the lever and detent ball and spring pretty inexpensively. Here's the links....
M&P Manual Safety Lever [1960] - $12.50 : Welcome to Speed Shooter Specialties
M&P Manual Safety Lever Detent Ball and Spring [2022] - $12.50 : Welcome to Speed Shooter Specialties
Also, from what I'm reading, installing a safety is dependant on having the right sear block IIRC, but I haven't been able to dredge up any more detail, so I don't exactly know what to look for in my pistol.
BTW, this pistol's test-fire date is Dec '14.
Any info, or even a push in the right direction, is much appreciated....