Persistent rumors have been that the FBI is still using 10mm, just not as general everyday issue. I once was at a shooting range in California with a shoot house that the FBI had previously been using, and found 10mm brass with that telltale squarish firing pin imprint that gave me the strong impression that it had to have come from a Glock 20.

I asked around a bit, and heard that it was their SF bay area SWAT that had been there earlier, but everyone was otherwise hush-hush about them. What I gather from other sources, at least some of their groups use 10mm Glocks as tactical sidearms, then 10mm variants of the Mp5s as their rifles, with the 10mm Mp5 variants as often as not being semiauto only. Apparently the Mp5/10s were getting phased out with age, but it is unclear what they are getting replaced with. That information was from 2005.

Pricks who questioned me in 2007 had what appeared to be Glock 19s, but could have been the .40 cal variants. I don't think Glock ever came out with a mid-size 10mm.

I forget the name of the lady, but I read a memoir type book written by a female FBI agent who was actually suing for disability over recoil damage to her right wrist and shoulder. She had apparently gone through the academy during the short period they were using the 10mm Smith & Wesson pistols but her main complaint was the 12g shotgun slugs.

From what I understand, the 1076 had complaints from the non-shooter types but then some agent on a drug case had one that somehow malfunctioned on the inside and locked itself up shut and totally inoperable. The problem was traced to a design fault and then the guns were all recalled and either junked or surplussed out. The civilian 1076 pistols were never recalled that I know of, but the FBI issue causes their value to be all over the map since nobody knows exactly what is wrong with them, just that one locked up and ceased to work when some FBI agent had a confrontation with some dopers in the early 1990s.