Troy, I believe that you are mistaken. CHP has been issuing the S&W 4006 for several years now. I have never seen or hear of them using the Glock. When our ChiPy gets into the office I will confirm this with him.
My agency (SO) issues the Beretta 96, but allows just about anything else for detectives and off duty carry.
Shotguns are all 870's for patrol. Winchester 1300 in S.S. for most detectives with a few Moss. 500's. I issued myself the only Ithica M37 the department owns. It was purchased back in the '70's and is in mint condition.
Rifles are Mini-14's. We are alowed to qualify and use whatever rifles we want, within reason, if we do not want the Mini. My partner and I are the only ones in the department with county owned AR-15's. One is a blood gun that would have been destroyed if I had not convinced the boss to let me bring it into our inventory. The other was donated to us by another LEO who moved to Austrailia and could not take it with him. Most of the personly owned guns are AR's. One guy is running an FNC, one has an AR-10, one has a M1A and two have Marlin .45-70 lever actions. The last two work in the high country and want the better penitration of the .45-70 for the woods.
One of the PD's issus the Beretta 96 and has 9mm Colt AR's in the car along with 870's. The other PD issues the Glock 23 and 22, 870's and just got in enough DPMS M4's for every car. The M4's have the 4 possition selector. They have the money to get what ever they want.
Our Probation Dept. issues the Beretta 96 or the Couger in .40 S&W. They have a bunch of High Standard shotguns that we gave to them. I do not think they are using them. The guns were trash when we gave them to them.