All recruites are issued the g22 on graduation, after probation they can pick from the approved list and buy from the Acadamy store all the gear.
I did find out that revolvers are allowed but only the old guys that are retiring still carry a 38 or 357. Apparently for them they have to take a course and get certified to carry a revolver.
When an officer chooses a different duty gun to buy, they can keep the g22 as their back up or off duty pistol.
I did find that special units such as swat and narcotics can chose 1911's if they want, but they are the only ones with that kind of leeway.
The other interesting thing I found, is LAPD officers have to do weapons qualification once a month, and tactical shooting every six months. They shoot the most out of any big city police force around, compared to NYPD that qualifies once a year. So they are intense and like the gun fighter mentality.
I would carry Glock 21 with a larger mag, and carry a g22 as a back up and off duty pistol. For added safety maybe a g27 on my leg of a 38 special as my burner.