My pal Mike Benedict is offering up a tool to aid in changing S&W M&P rear sights. It keeps the things that want to fly out of the slide from doing so.
Brownells has it…
http://www.brownells.com/.aspx/pid=41023/Product/S_W_M_P_REAR_SIGHT_TOOL
Rosco
When you buy a FSB (single or in a kit) from Apex this is the very tool that is included in the package. It’s worth it.