Anecdotal evidence: Three to four months ago, a shooting buddy in the IDPA club down here noticed his groups were wandering off, even at very close distances. I mean well over 100k, that is just when he stopped counting a year ago. Glock serial number chart. Of course, he had to pay all shipping and FFL costs. Regardless, the weapon had well over 100k. He sent his pistol back to Glock (G22), they discovered a problem had developed with the frame (I don't remember the nature of the problem, sorry), and replaced his pistol.