I seriously doubt someone relocating to another country would be able to carry all of their worldly possesions on the same flight they take to transport their person.
I'm sure it COULD be done but you'd have to pay a fortune for being over your alloted weight for a passenger flight. In terms of pound per dollar passenger flights are the single most expensive way to ship cargo.
More than likley he had his gear shipped via a commercial cargo flight. Hell for all we know it came by boat (which is actually pretty common)
If I'm wrong and he DID transport the stuff on a regular flight in his checked bags then I share the
Either way it's another airsoft gun in the country and that's nothing but good news.