Survival / military e-shops are quite popular in EU, although they mostly target people that play airsoft, do reenactment, survival, bushcraft and so on. Preparing for a coup or for protection against the government is not a standard target group in Europe :-). In Slovakia and Czech republic you can own basically any short or long weapon and any caliber as long as it's not full-auto. But you can of course only bring it to an official shooting range or match. Owning a weapon for self defense is possible for regular citizen and you can carry it with you (only concealed), but only for short weapons (pistols, revolvers). But it's not a constitutional right, it's a privilege and you have to meet certain condition. It's a longer topic. But I wanted to say that even though we have a lot of weapons, the gun crime rate is extremely low. Maybe that's also because every gun is registered, you have to take all the exams (medical, psychological, background check, weapon law test) and so on... It's also forbidden to bring a weapon (even if concealed) to a protest, your weapon license would be taken and say good bye to your guns. Weapons in hands of citizen doesn't equal to gun crime (also check Switzerland), but I am also not a proponent of constitutional right for everyone to carry a weapon. So it's maybe similar to social networks - they can become a danger if they are not regulated (same as weapons, if they are unregulated and freely available).