I have to agree that 9mm is world wide where the .45 is not nearly as common outside of the US. I was in during a time when the M-9 was new and everyone complained about it then. I own both and will say in my opinion the 1911 and .45 combo is a more accurate and more effective man stopper. That said the military in general has bought into the more rounds down range, the more hits theory and not that the 1911 is particularly difficult to take apart butthe M-9 is about as idiot proof as you can get. I would love to see the 1911 make a comback in the military world like it has in the civilian market. That single action trigger system is much crisper with almost no travel promoting accuracy.