it is a russian degtyaryov, probaby from WW2. The North Koreans and Communist Chinese had scores of them in Korea during Korean war. They also had many thompson SMG's from WW2
Back in the '70's I and several other police officers ordered M1 garands from the old CMP. When they arrived at the police station every one who ordered took one. No registering or record keeping. I learned my Springfield receiver was from December 1940. Still have the garand as well as an M1D.....
Old man, but still breathing. Kicking, but not hard. Puttsing around pistols and rifles. Taking grandsons to range for rifle and pistol practice as often as I can. Having them do the re-loading time permitting as they are both in school.....