My department's progression since my hire date:
Glock 22 Gen 2
Glock 22 Gen 3
Glock 22 Gen 4
Glock 17M
During the Gen 2 and 3 days, plain clothes officers could get a Glock 27 instead. How's that for crazy...
I still have my original gun belt and holster for "parade ready" occasions and it still works just fine. Even fits, almost too big.