1.  firing pin
2.  gun firing pin
3.  gun striker

• 1. 枪撞针: Hammers for guns and rifles | gun firing pin
• 2. 步枪撞针: rifle firing pin

• 1.所以，她把枪里的撞针卸了出来。
  So she took the firing pin out of the gun.
  dict.yoduao.com
• 2.辩护的中心是实际上丹尼斯并没威胁到任何人，因为，原来那支枪上的撞针事先被卸掉了，所以那支枪根本不能用。
  The gist of the defense argument was that no one had actually been endangered by Dennis because, it turned out, the firing pin of his gun had been removed and the weapon couldn't be fired.
  dict.yoduao.com
• 3.瞧，那撞针是整个枪的关键！
  See, the firing pin is the key to the whole case!
  dict.yoduao.com

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