* IMPORTANT : My method is different with guides from famous and proper modder of Source games, and shouldn't be used as a reference to learn modding.
Be mindful when publishing stuffs, and respect original creator.

I want to make it fast and simple but then it will leave more question than answer, so i will explain base on my knowledge. Once you understand it, it's very easy.

Please watch video below. Leave a comment if there is anything you need to ask.
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Here is gameplay of that MW19 RAAL : https://www.youtube.com/watch?v=-BucgHI-9jc