Read this on another forum>>>>>>>> Follow me on this and then comment. I was at the range today with a buddy of mine who has a C9. I was shooting my 995TS and Glock 42. I had never shot a C9. My buddy handed me his c9 and I proceeded to load the magazine with the three rounds. The three rounds fired perfectly and I had a tight group. I reloaded the magazine with three more rounds and it fired perfectly. Both good, tight groups. I then realized that I had loaded the C9 magazine with .380 rounds! Again, I had tight groups and the gun performed flawlessly. What's the scoop? I also learned to be especially careful when switching guns at the table.