James Yeager and associate put 1000 rounds, 68 magazines, through a Glock 19 in just under 14 minutes. 4 stoppages, some of which were attributed to bad ammo. The guide rod melted right off but it continued to function.
Part 1
Part 2:
Thanks to Jay for emailing me this video.
There is a discussion about this video at AR-15.com.