Suomi - for those of you who don't know is Finland. Suomi is Finland in Finnish. I know because I lived there for 23 years, my wife is Finnish and I speak Finnish fluently.
The Suomi M31 was designed in Lahti in the late 1920's. The Finnish Army (where my son is currently serving) used these carbines extensively during the winter war with Russia during 1939-1940. They also used Nagant rifles that they had bought from Russia in the early 30's. Getting an original M31 is a great collectors item. Replicas have neem made and are more readily available.