I know that some of the late war units had very suspect material, especially in the gas system...There was a write up on these in the last Guns and Ammo, Mike V purchased one and shot it with the gas system disabled as a straight pull bolt action. If your going to shoot it, that might be a good option. Save the wear on the springs, which if original will be of very poor quality, ditto the action as the port is probably oversized...
Beautiful rifle, i am very green looking at your pics! I really need to win a lottery one of these days .