Pretty sure the constitution says every man has the right to bear arms, not guns specifically.
Ban guns and carry round swords instead.
If a bloke goes psycho with a sword he's far more easily disarmed than a bloke with an assault rifle.
So no more mass shootings and everyone gets to keep their right to bear arms.
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An extensive gun control is necessary. Face it, the majority of Americans don't want their guns taken. Whats the need for Automatic rifles? To make the gun banners happy, ban those and keep semi automatic guns..