FIS and its icon library by m8r98a4f2 are super-ultra-great, but it lacks some icons for vanilla (and dlc) weapons! 
Fortunate to me, there is elegant-cool-awesome resource by Spherikal, from which I gathered up weapon icons that had not been used by FIS.
Some variation icons are BARELY (or just never) differentiable from the original, but I just included them.


Since I don't like way-too-colorful icons, I simplified icon colors of mine as following:
unarmed - WeaponMetal (grey)
blunt - WeaponWood (dark brown)
blade - WeaponMelee (light brown or dark orange)
heavy - WeaponHeavy (red)
energy weapon - WeaponEnergy (bright blue)
ballistic pistol - WeaponPistols (greyish blue)
ballistic rifle and shotgun - WeaponRifles (hardly differentiable with pistols, but little darker)
pipe gun and crudeblowback - WeaponRust (dark brown, somewhere between blunt and blade)

If you don't like it, just edit RedwormIconLib.xml as your preferences.


As title said, this icon library is designed to be supplementary to FIS and its basic icon library. Tags are made to resemble those of FIS.
Please refer screenshot to see what tags are and how they look like. 


INSTALLATION (including manual ini edit)

1. Install FIS - The NEW FallUI Item Sorter properly

2. Install this mod via MO2 or any kind of mod manager

3. Locate "(FIS mod folder OR Data folder)\Interface\ItemSorter\FIS\AutoTags\AutoTags_en.ini"

4. Insert following lines in 'proper' position, or just top of [Weap] category

Assaultron Blade=[AstBlade]
Kremvh's Tooth=[Machete2]
Mr. Handy Buzz Blade=[MrHandy]
Atom's Judgement=[AtomsJudge]
Sledgehammer=[Sledge]
Meat Hook=[MeatHook]
Salvaged Assaultron Head=[AstHead]
Tesla Rifle=[Tesla]

5. Or you can utilize Instance Naming Rules (INNR) in esp plugins


CREDITS
m8r98a4f2 for awesome mod and framework, and his guide to make icon library
Spherikal for cool icon resources
Video guide how to make icon library (don't care Cyrillic alphabets, just carefully follow his mouse pointer then you can make it by your own)

Used tools: Adobe Animate & Illustrator (trial license), JPEXS