I too would like to know the correct size. I tried to remove this to clean and polish the plunger. I tried a .050 wrench, but it is slightly loose. Too loose in my opinion.
Bkreutz - I have used this technique on other equipment, but with my firearms, I try to use the right tool for the...
I got to put some round thru the new M&P! It was 30*F so only got 50 thru it, but I am happy with it. I was also working with my wife and her new AR, so I couldn't completely dedicate my time to the M&P.