As Bill said, restrictions on who can buy guns and what kind of guns are needed in any country. And of course it's hard to identify possible misusers - but the fact that something necessary is hard is never a good reason not to do it.

What I find hard to understand how any sane gun enthusiasts would not agree to that. I can understand there are some who would see things like that as being a step towards a total ban, but not how they can be anything but a fringe minority among gun owners, to be ridiculed and disliked.