I believe some European armed forces use them. Offhand, I do not remember which countries. I have a new infant that keeps me forever tired. My memory is not so good right now
Germany and Austria for two. They are also used by some euro police forces too, but they are not used as front line infantry weapons. Rather, they are used by rear echelon and support troops, and sometimes in armor. The military version has a much shorter barrel that the civilian version available in the US.