This people look like People's Militia (Narodnoe Opolchenie) or partisans. Opolchenie could be armed with almost any weapon, including some stuff left from WWI, even captured enemy weapons. You see, the guy at the right with a strange rifle has a red band on his non-uniform cap, like Red Guards in Civil War.
When my Father was a cadet in 1943-44 they were armed with Arisaka 6.5mm rifles left from WWI shipments. He said this rifles didn't have blue, and to keep them from rust they had to polish and clean them almost all the time.