袭击者用枪威胁他们。

The attacker threatened them with a gun.

《牛津词典》

警察用枪指着他。

The policeman pointed his gun at him.

youdao

他希望在接下来的狩猎季节用十字弓狩猎，因为他厌烦用枪狩猎了。

He is hoping to use his crossbow during the next hunting season, as he has become tired of using a gun.

youdao

There'd be certain activities perhaps, for example putting a gun to your head, that would put an end to your life.

也许会有某些特定的活动，比如用枪指着你的头，会结束你的生命。

耶鲁公开课 - 死亡课程节选

because you're thinking the guy might be trying to steal your car, put you at gunpoint, hijack you,

因为你会想这个人可能是想偷你的车或用枪威胁你，劫持你，

大城市是否危险？ - SpeakingMax英语口语达人

And one of the brothers points a gun at the police officer.

兄弟中的一个用枪指着警察

耶鲁公开课 - 心理学导论课程节选