In the gun control thread in the Social Justice section, the vast majority of Catholics are not anti-gun.
The numbers are much more even in the big picture, but that’s only if you include cafeteria Catholics. On an actual Catholic forum such as this, you’re always going to find most people are not anti-gun. The exception would be if you visit an Anglo country. England is uniquely hostile towards gun ownership. Even Germany and Scandinavia, which are otherwise generally more liberal then England, they are more apathetic towards the subject. They don’t own guns personally, but they’re not as fearful towards them as an ethnic Anglo might be.
It’s related to ethnicity and subculture more than it is on Catholicism itself. New England has been annexed by secular liberalism and New England is also Irish. That makes for a lot of anti-gun people that also happen to be nominally Catholic, because their grandmother asked their parents to baptize their kids and they swing into the parish on Advent. There isn’t necessary a link between the two. If you go to Texas (where Catholicism is experiencing healthy growth) you’re not going to find the same sentiment.
Although admittedly, it’s very difficult to find a subculture that is more “pro gun” than conservative protestant US. Catholics might not be gung-ho about it in the way that they are, but that isn’t to say that they’re anti-gun either.
Personally I support the right to gun ownership, but it’s not an issue I honestly care a whole lot about compared to certain other things. To some of the more flamboyant gun owners, that could still be perceived as not necessarily “pro gun”.
Catholic ethnic groups that are anti-gun are those groups which are in the process of dying out. Most of their children are disengaged with the Church.