+1, and it's worth mentioning that the Soviets captured many thousands of these on the Western Front, but IIRC didn't deploy many of them during WWII because they could only have been used with captured German ammo.
Since the Western front was France and English forces west of Germany, I think you meant the EASTERN front. Although after the surrender, the Soviets could have picked up Western front weapons surrendered by Nazis I suppose.
Its worth mentioning that perhaps, the gun is actually a MP 38 which was the forged steel high quality predecessor to the MP 40. The MP 40 was made from sheet metal stampings, but as a wartime expediency arm, it was one of the best SMGs IMO. Looking at the photo, I cannot tell if its a MP 38 or MP 40 myself.