Hi Henry B -
My Fg42 was made by Krieghoff in 1944 - it is a reconstituted parts kit (WAF classifieds) - with a semi-auto only bolt and op rod made by SSD (an original FA op rod can no longer be installed) and semi-auto trigger parts custom-made in the US (922R) - the L marked ZF4 scope is original as are the covers and shades, however the mount itself is an SSD reproduction, the sling is from an M53 and is the sturdiest and best MG sling I have found.
(Simpsons have an original Fg42 sling for $750, but I am not quite that anal, yet, lol.)
It is 7,9x57 - as it was when it left the krieghoff factory.
The Mag crate was found through a Facebook European collectors group and came from Germanyicon.

Hey Sprat - hope you are well, sir.