I got rid of my 21 merely because it was too thick for my hands. It "appeared" to have the same internals and striker that my 19 and 34 have. I have heard of the unsupported chamber before but never that they wouldn't go boom, one way or the other. Based on my 19/34 and 21 experience I wouldn't hesitate to buy another glock. Would love to see some links to data on these "design flaws" because I am not sure I understand what the actual issue is.