A Glock 17 after having 378,000 rounds fired through it. Apparently the barrel broke only once (when it had fired the 378,000th round from the translation), and the firing pin spring and the recoil spring have been replaced once. This would be safe to fire after replacing the barrel. Pretty damn cool.
Hirtenberger make ammunition, among other things, so I’m assuming this was the gun they used to test 9x19mm rounds.