No contest, a brand new Glock 19, I think it was 2nd Gen. Absolute garbage. First time to clean it, the guide rod (made out of papier-mâché I'm guessing) split into about 5 pieces upon disassembly, locking up the weapon. Got it apart, got a new one from Glock (3 week wait), put it in, go to range. At 25 yds, it held about 4" - 4.5" groups. That's fertilizer.
This was in addition to having the ergonomics of a bar of Irish Spring, a grip angle built for a Gorn, a trigger reset that felt like a plastic ballcock repair kit and the dumbest 'take down' manual of arms for a modern pistol ever.
Yeah, Glocks are cheap. Yeah, most Glocks go 'bang' when you press that bizarre excuse for a trigger they come equipped with, but for the $375.00 LEO price I paid for it (a group of about 10 of us bought them to get that price), I still felt ripped off.
Absolute last in my lifetime Glock I will ever, ever own. Their myth of 'perfection' is a laughable joke.