I really do hope that the spontaneously disassembling pistols were, in fact, due to the slide lock being inserted backwards (I've done it myself once or twice when rebuilding a couple dozen Glocks at a time - attention to detail is everything!). What I'm concerned most about is that "one size fits all" spring isn't stout enough to do the job that the old dog leg leaf spring did, WRT keeping the slide lock where it belongs. Time will tell...