All the M&P's have the "hole" for the lock. Most just have a black plug in that hole. 99% of all of the M&P's are without the internal lock, and as to date, I've never seen one myself, and I've been looking.
This hole is nothing to worry about, and can be gotten rid of if you want after the fact. I'd say for about 40$
This hole is nothing to worry about, and can be gotten rid of if you want after the fact. I'd say for about 40$