In many countries the 9mm Luger, 9mm Para, 9x19 is considered a "Military round," and civilians are not able to obtain it. The 9x21 was a get around for people to own guns basically chambered in 9mm without using the banned military round. Italy being one of the countries. You're not going to see normal 9mm Glocks in gun stores in these countries. You will however see these 9x21 variants. Didn't mean to come across as a dick by the lol. Just thought most people knew this. My apologies.