If we have read about civilians threatening other people with airsoft guns, here's one from Hong Kong  as reported by Public Enemy. A man was arrested for threatening workers who were renovating a separate unit on the 10th Floor Taikoo Shing Ning Court in Quarry Bay. The man was annoyed by the noise being made by the workers doing renovation as they were tearing down the walls. This made him barge through the door with an MP5 airsoft gun scaring them to stop the noise.

The Hong Kong Police was called into action and arrested the man. He is lucky that he wasn't shot dead, if he's in the U.S.A. he would've been killed by the Police according to Public Enemy.

Here is an illustration of the incident as made by Next Media: