I just got back from taking an armorers course for Glocks at Front Sight. It doesn't certify you as being a Glock armorer, but was very good. I haven't had my G19 for long and hadn't taken it apart before I went to the class. They showed how to take it completely apart and even better how to put it back together and what to look for if the gun is having any problems. They give you a users manual and the instructor even gives out his phone number for future questions you might have. It was very informative. I can't wait to take some of the other armorer courses: Ar15, XD, and 1911.