The barrel band is placed too far from the muzzle for M39. Maybe it's M27 or M28? (see here, 7,62 mm Infantry Rifle M/27 and M/28). Greg-Z (talk) 14:04, 29 June 2017 (EDT)
Many thanks for the help! It's M28. Pyramid Silent (talk) 14:09, 29 June 2017 (EDT)