To preserve flat Disc and spring under rear sight, Brownells sells an M&P rear sight tool for $3.99. It's money well spent. Sights come off the gun using the methods shown above from left to right and install from right to left. It an easy job. Once you have sights installed it is suggested to use a few drops of RED thread lock around the edges of the sight. Let it soak in and then clean up with dry q-tips. Not that difficult. Take your time and be careful.
S&W M&P.40 4.5, Ameriglo Night Sights, Apex DCAEK
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M&P 40, M&P 40C,
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