There had been incorrect suggestions the gun Hore supplied had caused a serious injury to the unlicensed person.
In fact, Hore had no connection to the incident in which the man was injured, Mr Robinson said.
He supplied the gun to the man at 8am and the incident happened at 3pm the same day.
Mr Robinson said the offence was "at the lower end of the spectrum" and Hore's work opportunities overseas could be affected by any conviction as it might exclude him from entering the United Kingdom.
Hore had work available during the Rugby World Cup and a conviction could result in him suffering a "substantial financial loss" if it meant he could not travel to some countries where he had work lined up.
He had been granted diversion 10 years ago but the court should place "little or no weight" on that, Mr Robinson said.
Hore's wife and children were British citizens and it was planned to hold the children's christenings while the couple were in the United Kingdom.
Charges laid against Hore and three other people arose as the result of a police investigation into an incident on the opening day of duck shooting in which a duck shooter received a serious injury.
The duck shooter was injured when a gun discharged after it fell off an all-terrain vehicle.
The man was dealt with by the court last month on a charge of unlawfully possessing a gun after his firearms licence was revoked, and two other men were earlier dealt with for possessing a gun without a licence.
Police had opposed Hore receiving a discharge without conviction.
Judge Flatley said the fact Hore had been given diversion in the past was an aggravating factor.
The defendant had not checked whether the man had a firearms licence before loaning him a gun and there was the potential for poorly-managed firearms to have serious consequences, including fatalities.
Hore, being a rural man, and having "previously being involved in similar type of offending" should have taken more care, especially as he knew alcohol was likely to be consumed during the day, Judge Flatley said.
The defendant would have to disclose the conviction when entering a country.
Police prosecutor Sergeant Ian Collin said there was no "mandatory" disqualification of entry into the United Kingdom if there had been a conviction within the last 12 months, it fell to the discretion of an immigration officer.
In 2005, Hore was one of three Otago farmers convicted and fined for killing a protected fur seal on the Otago coast.
He had faced a firearms charge then but it was withdrawn by police and he was granted diversion on that charge after paying a donation to a charity.
