Dan sent us these photos be took at the Imperial War Museum in London. This M1 Carbine, which was used by Norwegian resistance during WWII,  has a German ZF-41 scope attached to the handguard. The German ZF-41 scope was the original “scout-style” scope. It has a long eye relief allowing is to be mounted in front of a Mauser action. Jeff Cooper adopted this concept for his Scout Rifle. The ZF-41 with its a low magnification of 1.5x, would have made a good scope choice for a carbine such as the M1, the downside was that these scopes were quite heavy and built like tanks!