Niko on a gun?? Wow! Just make sure they're okay with the violence you perform, guys!
Anyway, hello there! If you know, there was already a Niko charm on the workshop (https://modworkshop.net/mod/39006) however its broken as all hell. No offense to the creator as they got me (and a couple other people who did most of the heavy lifting) to make a revival of this charm that actually works.
Big thanks to the many people on the Modworkshop discord who helped me in several ways (Including just rebuilding this whole mod) and being overall good people.