And are they any better now? If you looked up the things I mentioned in my earlier comment, you know that UK has firearms available to civilians that aren't particularly less lethal than what the Christchurch terrorist used. They haven't been used in a similar way yet for the same reason why New Zealand didn't have any problems for over 20 years before this - because these events are so rare in general.

OTOH, looking at New Zealand's eligibility laws, one thing that stands out to me is the lack of a mandatory mental health exam. So it's like US in that regard - only already-diagnosed mental health issues can block ownership.