My Department was issuing S&W Model 66's and Model 39's to plain clothes officers with the individual officers able to carry almost any reasonable handgun just so they could qualify with it (ammo at their own expense). Then one day in 1992 the "Day Lords" drank the Glock Kool Aid (and got all sorts of freebies in the process, but that is another story).
I had to put up my Sig P220 and switch to Glocks in 40 S&W. We had a 600 rd. transition training during which we saw all sorts of problems with fail to eject, fail to feed malfunctions. There were a few caused by limp wristing but far too many cases compared with even S&W Model 59's. Hmmmmm. Glock came in and replaced all the magazines, they redesigned them so they didn't need to be pulled from the pistol upon trying to reload, but didn't improve functioning.....later another new set of magazines, this time with steel inserts and the damned things still malfunctioned, better but not by much. Glock came out and replaced recoil springs, to a captive system and replaced them a second time to another improved design spec. Yeah Glock claimed that they could be fired thousands of times new out of the box, dropped from airplanes and function reliably.....only they could not.
There is a reason the transition course had so many function drills, we needed them. After 3 sets of redesigned magazines, two sets of reconfigured recoil springs and work done on the triggers the problems seem to have settled down. They threw in new barrels too, so I didn't get the dreaded "Glock Smile" on my brass. I still have mine in the safe, but don't carry it. Our department had 120 new Glocks, and experienced over a 20% failure rate with those pistols new........that is each day at the range, 20% of the weapons had at least one malfunction. Listen to the Kool Aid salesmen at your own peril.
I have no idea what "Generation" Glocks we had. They tell me they are much better now. Mine runs well now. The process to get there was long. I carry a cheap little S&W Shield 40. It has about 900 rds through it. Zero malfunctions, zero fail to fire, zero fail to eject. Leaded like crazy with cast until I started powder coating.....but went bang every single time I pulled the trigger.