Maybe I'm the only one or maybe it's because I may never actually own a glock (I have shot a couple), but I have the hardest time understanding what the model numbers translate too. I.e. Is a Glock 22 a 9mm compact and a Glock 23 a .40 compact? I have no idea. I could probably go to glocks site and try to make since of it by looking around but was hoping someone had or knew of a simple formula for such a thing. I get tired of clicking ads I have no interest in buying just to try and figure out what kind of Glock is being sold. Thanks for the help or make fun of me a bit, I probably deserve it for being lazy.