Side Scroller Shooter Kit - Cover system, Human AI, QTE System & much more!

Hi there!
Where can I find the guidelines and overall description of the weapon system, I want to interfere with it and overwrite basically all core functionality of it, but code is quite convoluted and because it has pretty much zero encapsulation am not sure where exactly I can do it so everything else not falls apart.
Also, the engine sometimes doesn’t delete redirectors from a drive, there are quite a lot of junk inside the project right now. https://puu.sh/vPsNH.png