LAPD has I believe three authorized manufacturers that can be used for standard issue Beretta, Glock and Smith and Wesson. LAPD Metro SWAT has Kimber 1911. LA County Sheriff still has Beretta and PDs around Southern California use autos of different makes or calibers. I have worked with or met officers from Sacramento to San Diego and I have not seen a revolver used as a primary weapon on a active duty officer for years.
It's funny how this went from How BFA's work to the use of revolvers on film.