A little addon mod I cooked up for my own playthru and I thought I would share it because the only reason I made it was because It was something I wanted badly and could not find anything on the nexus or otherwise. 
[Updates]
v1.2 smoothed out the holster meshes and made mod forward compatible with any future holstered weapon mods I release.
v1.1 Lowered weapon further into holster, hopefully I didn't make the holster mesh to ugly by stretching it out. Added to do list to main page for upcoming features.

[To-do]
Add western revolver from vanilla game to be holstered.
Add hunting revolver from The Rizzler's mod to be holstered. (Not all assets match up to ranger sequoia so this might be a pain)
Add holsters to match different skins from Cross_MojaveManhunter mod. 

[Requirements]
Cross_Mojave Manhunter 
The Amazing armor mod made by Niero. This Visibly holstered Weapon is made to fit specifically to this armor.

Hunting Revolver and Ranger Sequoia
Outstanding mod made by TheRizzler1. The unique Ranger Sequoia in this mod is the gun we will be holstering. Currently only works with the ranger Sequoia and not the hunting revolver.
 
Visible Weapons - 3rd Person Holster
Awesome Framework by Registrator2000. This is the mod the will allow you to holster and draw your weapon.

[Installation]
Install esp anywhere below required files in load order.
Each holstered weapon mod I release will come packed with a TanoHolsteredweapons.esp and an esp file for the specific weapon(s) for the individual mods.
Make sure TanoHolsteredweapons.esp is above any other of my holstered weapon mods.

[Description]
Anydangways this mod adds a craftable Ranger Sequoia to the Chem Workbench under the category "Tano's Holstered Weapons" this is an armor piece that is fitted to go into the empty holster on the Mojave Manhunter Outfit. After crafting the armor piece you can link it to the Ranger Sequoia Weapon and the armor piece will equip and un-equip itself as you draw/sheath your weapon. I also edited Niero's script, used to keep the vest and belts from clipping, to make the sheathed weapon fit under the coat when you equip it. (Makes it disappear basically when the coat is equipped) 

[Recommended Mods]
Classic Holstered Weapon System
This mod is the bees knees. It displays your currently equipped weapon on your person when holstered and shows all your weapon modifications. Only works with currently equipped weapons so your stuck showing one weapon at a time. I personally set this mod up to show only the weapons that are equipped on the back as these are the ones more likely to have more customization options and then use Registrator2000's mod to show my side arms and melee weapons for an "All geared up" feel. 

[Credits]
Niero, TheRizzler1, and Registrator2000 - for their awesome mods that this mod adds on to.
Friffy - for his amazing tutorial on how to make mods like this found on his visible weapon pack here.

[My Other Mods]
Tano's Holstered Weapons - Laserswords
Cross PlasRail 1st Person Flashlight Fix
Piper by PokePefk Hat Patch (Automatic Hair Switching)

[P.S.]
If anyone likes this mod and is better at screen archery than my smooth brained self, it would be awesome if you could send me better screenshots to use on this page!