It is a MU-12 single shot .22lr. I was told that this gun was made for Russia for the Olympics and that not to many where imported to the US, it has a C.A.I. import mark on it. It has 2 triggers, the first is a set trigger and the second fires it. It is a heavy gun. I have shot it and it is accurate. All the numbers match except the hook thing on the butt.