回複：謝謝個位的回複，還有問題

用槍嚇唬他可以嗎？This is a dumb question, and it will pay dear price. Remeber, if you have to use weapon, you need call 911 at the sametime or at least afterwards. In some cases, even display a weapon can result in a jail sentence.

在公共場合，用各種防身器可以嗎？This is even dumber.

Have been in US for almost 20years, I know a lot of mistakes oversea Chinese made on the weapons.

My advice:don't touch any weapon if you can avoid.