From a simple pistol to the powerful chain gun with infinite ammo, each weapon causes unique, and sometimes very visceral, damage.

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That documentation could then help the police trace a gun through the chain of possession from first retail sale by a licensed dealer.

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But one cinema chain in Beijing has jumped the gun and splashed an ad for an Apr. 26 opening.

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Stocks of other gun companies fell, and one sporting-goods chain said it would temporarily stop sales of military-style firearms.

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