Classic Holstered Weapons System (CHW) Mod
MODFinally, a proper engine-level system for showing holstered weapons on characters, with various customization options.
As we all know, for Fo4 Bethesda decided to remove physical appearance of holstered weapons on characters, now when a weapon is holstered it's just vanished in the air.
Of course, the mod requires f4se and game to be launched from f4se launcher (f4se_loader.exe).