In Czech Republic you need an exception to buy something like AR-15, however the exception is quite easy to get. Long weapons magazines are limited to 10 rounds.

But most importantly, in order to buy a gun you need to get a license. This means medical check, passing a theory test, passing a psychological test and passing a practical test at the shooting range. It's not trivial at all.

The culture is completely different to US. Everyone is keeping their weapons in a safe. No bedside tables, car glove boxes or other nonsense. I've never heard of a child taking their parents' gun.