In 2007 I purchased a used Glock 21. I checked the serial number and found that it was one of the an E series that Glock had had a problems with. I called Glock and they was very nice about it. The customer sevice rep said they would have to order a new frame from Austria. After sending it in, I had it back in 6 week. The gun was completely new except for the slide and barrel. I couldn't be happier.