The two LE agencies I have worked for issue Glocks. I have personally seen and experienced numerous extractor failures, so I would replace it as a matter of course. Magazines are another area of concern, check the springs frequently. If you are going to trust your life on a Glock (or any other auto pistol, for that matter) keep up with malfunction drills, so that clearing jams is second nature. However, if the extractor breaks, tap, rack, bang won't mean much. Usually, limp wristing results in a stovepipe, but in extreme cases can cause short stroking causing the pistol to close on the spent case.