Original product page:

https://otghex.com/products/mkiii-outside-waistband/?navselect=group3

Imported years ago after a long wait for custom work.  Fits my VFC M&P9 full/duty size gun with threaded barrel snugly, can't comment on other brands fitment since I've not tried myself.  Comes with a G-Code RTi hanger which is removable and the 3 hole pattern fits blackhawk and any other mounts that are the same spec, plus can be easily drilled for other mount types.

Has a pair of grommets and included long bolt/nut that mean it can be used with or without a light mounted.  Fits my x300u and older x300s, will of course fit guns without threaded barrels and if the frame/trigger guard area on your M&P is the same as a full size but with a shorter barrel and slide that'll work too.

The quality of kydex work is superb and I never skirmished it just put a gun in and out a few times.  Price is all-in.