The actions used are actually Prechtl supplied units,
metallurgy is also different, Prechtl being a modern alloy CroMolly (as are H&W magnum mauser actions)
whereas FZH are old school by using carbon steel..I would definitely prefer the more modern alloy versions
for high intensity modern loads and chamberings.

Original pre-war Rigby .416 magnum mausers were exclusive foreign contract Oberndorf built rifles,
the London Rigby shop then conveniently foiled over the foreign built product by engraving their own
British company name & address on the barrel.
No different to the UK companies like Daniel Frazer and Bristol-Gibbs, who imported European made
Mannlicher rifles and marked them with their own British company names.

-- and with others things like Rigbys .275 bore, all Rigby did was re-market the german 7x57 and stamped
the rifles .275 bore accordingly. The .275 bore Rigby rifles had the German made and std. original
7mm mauser spec. chamber and bore. There was never a proprietary .275 Rigby cartridge released, nor
did Rigby have made any loaded commercial ammunition marked .275 Rigby on the brass...Rigby simply over-
labelled boxes of commercial 7mm MAUSER ammunition, with a bit of paper that said Rigby .275 bore

In regards to criticism of the new Rigbys stock dimensions, keep in mind that Harry Selbys old Rigby .416 wasn't
to his personal liking either upon purchase....He set about modifying the stock to suit himself...so anyone that looks
at Harrys rifle and admires its for its stock design and looks, be aware that it certainly didn't come from Paul Roberts
Rigby looking, weighing (or handling) like it does.