Ok so here's my feedback
Weapon
I don't usually go into this area but this weapon isn't enough to battle Grimm. Your fists and a plain revolver won't be enough to combat deadly Grimm.
There is a reason that people usually build their own weapons in Signal and it's because normal weapons don't work, or don't work nearly as well.
If they did the military could just go in there with a couple or rifles and- you get the picture.
I look forward to her edits