tell me something about owning a gun in your country

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i just see a news on the internet that there is one more gunshooting in a campus in the USA. why do this kind of thing always happend there and many innocent are killed due to shooting death. As a people from a coutry where owning a gun is illegle, I can not understand this. Hey, guys, are you now in a country where allow its citizen to use gun? just tell me some opinion about guncontroll.