I was watching a training tape today and noticed that SFPD now has reequipped its Specialist (SWAT) team members with MP5s in 40 S&W. This makes sense as SFPD issues and requires its officers to carry the Beretta 96.
My personal like about the larger caliber SMGs is the design of the magazines. Those straight stick magazines fall freely and allow for faster reloading. There's also a bolt hold open on the larger caliber MP5s.
Does anybody know of any other department which has gone over to the 40 for their SMGs?