A man has denied supplying 241 firearms to an unlicensed person after an armed police raid in east Auckland uncovered the cache.
Firearms dealer Clive Jordan, 61, also faces a charge of unlawfully possessing two canisters of tear gas.
He conceded the allegations sounded "quite extreme", but said he would defend them "vigorously".
When Jordan was moving house last year he needed to find somewhere to store the weapons and had to look no further than his neighbour Murray Kerr, who had earlier decided to install a large concrete and steel, fire-proof safe in his house at the suggestion of a friend.
"I had a bloody big safe underground and said you're welcome to use it on the proviso there is no ammunition," Mr Kerr said.