The two guns fired almost simultaneously.

两支枪几乎同时开火。

《柯林斯英汉双解大词典》

Authorities say they quickly killed two of the gunmen, but two others continued to fire machine guns in the extended battle in Pul-i-Alam, Witnesses say U.S.military helicopters were part of the response force, and one aircraft fired a rocket into a multi-story building which the insurgents had seized, used to launch their attack and had rigged with explosives.

VOA: standard.2009.08.10

Here, you can only carry two guns at a time (in addition to your skyhook).

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Axton is a commando soldier while Salvador is a "gunzerker" (think crazy guy with two guns).

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On September 29th a boy brought two guns into his school in Cazenovia, Wisconsin.

ECONOMIST: Much to mourn, little to learn