I’m picking up a AR 43 sporterized ZF41. It retains the ZF41 base but the scope rail was cosmetically milled off. Would this be a post-war modification/sporterization? Or did the Germans ever mill off ZF41 rails like they did on ZF4 rails on the K43 series of rifles? Trying to figure out if the milled off rail is a legit variation or not. Thank you.