Czechia: To get a gun for self-defense, you need to get a permit, which includes mandatory training, tests and a psychological evaluation (which, from what I've heard, is not hard to get). You need to have a clean criminal record and they check your misdemeanors too (you may not be allowed to get a permit if you've had issues with public drunkenness for example). However, after that you can not only buy a gun but also are automatically allowed to concealed carry.

There are several types of permits and getting a permit for sports or hunting is slightly easier. You need to be 21 years old to get a self-defense permit, you can get a hunting or sports permit when you're 18 or in special situations (used under supervision) when you're 15. The permits last 10 years, but you can lose them if you get a criminal record. The gun permit registry is managed by the state police, so it's easy for them to check the validity of your license if they need to do so.

Gun violence is very rare, so I'm happy with this and see no reason to change it. The people that I know who have a permit (it's quite uncommon) are very responsible with it.

There are restrictions on which weapons a civilian can buy. No automatic weapons for sure, but I think you can get some semi-automatic guns with a suppressor (cause I've heard a guy recommending one such gun with sub-sonic ammo for potential home-defense, stating "if I really have to use it, there's no reason why my family should go deaf in the process", heh).