The MGW sight tool appears to work just like it does on SIG-Sauer pistols where the backward travel of the slide into the sight tool is limited by the slides dust cover. So it makes sense that it won’t work on the M&P9L because that slide is longer in that area.
A trick I use to make front sight installation easier on SIG-Sauer and M&Ps is to use a triangular file and remove just a little metal from the front, rear and bottom edges from the sights right side (basically tapering it a little bit), I also coat the dovetail and bottom of the front and rear sights in Militec-1. It makes starting the sights much easier. Knowing how much to remove comes with experience, I’ve probably installed sights on at least a hundred M&Ps now and a 2-3 hundred SIGs. Another tip: Use Birchwood Casey Aluminum Black to remove any brass marks, works on aluminum and steel.
I used to have the MGW sight tool for the 1911. Used it many, many times on probably several dozen guns. Always 100%. Sold it when I got out of 1911 building.
Damnit, I can’t get my rear .45 sight to budge after beating on it with steel and brass… I don’t want to shell out $150 for something I may use 6 times…
Thanks bud, but I need to get at the plunger for a little TLC then put back on the same sight. There’s a tad bit of drag in the very last part of the trigger pull which has to be the trigger bar to plunger contact.
Thanks to some very fast shipping by Mr. Bowie and by the folks at G&R, I received both my sight tool and the three new Bowie designed Ameriglo tritium front sights for the M&P. I followed the very easy to use instructions and in 30 minutes I had switched the front sights on all three of my M&P pistols.
I’m VERY happy with the performance of the tool. If you are interested in the M&P as your go-to platform I would heartily recommend acquisition of the sight tool.
Those look pretty good, though I wish there were more sights made according to my preference: both front & rear with serrated faces and tritium inserts (without white outlines).
I just used the MGW M&P sight tool to install a set of Bowie Tactical tritium sights on a co-workers 45. It was a total pleasure with the sight tool, no issues at all. It also did work well with the Bowie rear.
then put back on the same sight. There’s a tad bit of drag in the very last part of the trigger pull which has to be the trigger bar to plunger contact. 
