@stevenrkorea I don't understand why people like yourself have such a problem with ballistic weapons firing in space. Look it up yourself if you don't believe me instead of going off of stubborn assumptions. I do agree that (almost) all guns cannot fire underwater. BTW I don't support Call of Duty at all but I do support scientific facts.
I wasn't sure about this so I Googled it but apparently every article I have read says that you CAN fire weapons in space because most modern rounds create there own chemical reactions without needing external Oxygen so that they do work in a vacuum.
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