MAC looks at the last 3rd Generation S&W semi-auto that was adopted by a law enforcement agency.
The procurement of this pistol had a small controversy as well. CHP put out a procurement(around 2006-2007) notice and two companies responded - S&W and Sig Sauer (then Sig Arms, IIRC)
SIG Arms filed a lawsuit after S&W was chosen. I haven't followed up on what happened to the lawsuit, but 4006 TSW remained as the issue pistol.
When issues, there was a sear problem which were fixed
From: Military Arms Channel