A LGS has a 1943 dated SxS with Nazi markings. It has a modified butt stock, a raised comb is grafted on to it but it uses the stock butt plate. The shop owner thinks it was used to train anti-aircraft gunners in leading the target. It is a 12 gauge 70mm shotgun and is in good condition. I am wondering if anyone on this forum might have any knowledge of these things. I have scoured the interweb with no results. The shop owner will be researching it before putting a price on it, military history is a speciality of his.