Ducking hell, even when i quit all of it and get rid of all the files i made, own etc... still something forces me to come here xd
i am not going to talk about retextures much, i will leave a short thing - keep it going man, simple subtle edits are always best.
Tho here is a thing you could consider - working around shader maps - do not work around normal maps if you do not feel good around models etc, but try to work around specular maps - it can make huge of a difference on many models.
Why i am telling this? Pistol recolor into the "two-tone" made me think about it.
Pistols like Jericho are made out of polymer - excluding that, a "TAN finish" is a total mat finish on the non-metallic parts (even on metal parts, the tan finish stops sun reflections in a way) - you could darker that part of a gun in a _S file to make it looks a bit different.
You could also brighten the upper part of a pistol to see how of a difference between "ohh shiny" and "non-shiny" you going to get.
you will for sure will have to that kind of edit on the "custom guerilla" you edited into the police vest - because it will still shine like dog balz in the light xd