Hiya,
If you managed to get a reply from the manufacturers, Maushin, Hudson etc they should know I'd guess as they would need the same info at model gun design?
I don't know if German Import regs would insist on Health & Safety Data Sheets perhaps for anything imported in? I know that hazardous materials manufactured in the UK must have Data Sheets available to customers.
Maybe someone like a Japanese dealer, or Hong Kong even might have something unless modelguns.co.uk or modelguncollector.co.uk can advise you?
Cerwyn
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Hobby collector of mainly WW2 era uniforms, headgear, field equipment and replica weapons.