I just got a m41B sniper. Perfect blue conditon and perfect tiger walnut stock with proofs, but no serial number on stock...where is it locatred? Numbers alre all matching on 1917 Gustoff. Scope and rail matching, but different from rifle. Pefect optical..perfectly bright and clear.Sight is a strage civilian version of M55 sight. Question...since this rifle appears to be arsenal reblued..is that right? There are also to drill tap holes on top of rear reciever...for no apparent reason. Is this real or a SARCO put together...I paid $1600 and the guy said it was the best they ever had in...based on codition. But is it real? Help