Thanks for the response. I'm from a European country that is even more restrictive than Poland and I used to shoot there before I moved to the US, so I have some idea of what it's probably like. I might be conflating a broad range of US mass shootings - for instance I'm thinking of the Las Vegas shooter, who planned meticulously for a very long time. Now, granted he could not have amassed a dozen AR-15s in any other country in any amount of time, but I believe he could have done something. Could a guy like that get a gun in Poland? I don't think it's out of the question. I know the Columbine shooters probably could not have. But then, they made home made bombs too, which they could probably have done anywhere. We just don't see evidence of this kind of motivation showing up in other countries.