As I said in my intro post, I have a stupid question. I am considering buying a Glock 9mm for two reasons. 1) I don't have one and 2) the ammo is cheaper than my 1911 .45 pistol uses. When I search the 'net for the best places to order 9mm ammo, I see '9x19' and 'Luger' ammo. On a couple of ammo search sites when I search for '9x19' ammo, it finds 'Luger' ammo. What is the difference and what is supposed to be used in Glocks? I tried a search here and did not find anything useful.