NovaFinch's ASh-12.7 Battle Rifle ported from the Fallout 4 mod with the same name by Grey, integrated into both the Capital Wasteland and the Mojave Desert by Sweet6Shooter.
Compatible with TTW 3.3 without any additional configuration, spawns on enemies at around level 22.
Has 3 weapon mods: Scope, suppressor and extended magazine.
Contains a full first person kNVSE Set with equip, unequip, reload, partial reload, attack, inspect, empty and full ammo checking animations made by yours truly by referencing Escape From Tarkov and Call of Duty Modern Warfare anims.
Mediafire link in case nexus refuses to let you download it.


 

kNVSE Animation Plugin - Required for the animations.
xNVSE 6 - You should already have this for modding FNV.
B42 Inspect - Required for the inspect and magazine checks to work.

B42 Weapon Inertia - Looks nice.
FOV Slider - imagine playing at default FOV smh (I use 90 Player FOV and 80 World FOV)
DN Weather - The weather mod I use. It's the best looking one on the nexus IMO.
Movement Animations Remade - Works perfectly with my anims and looks quite nice.

Thanks to:
Grey for porting over the meshes and textures from Fallout 4 and setting up the base esp.
Sweet6Shooter for accepting my request and integrating the weapon into the wasteland.
NovaFinch for giving me permission to port his mod.
GoldenCrusader and Nickheggo for screenshots.
 Januusz aka Johnsonn for his rig, tutorials and advice.
The Shiny Haxorus for his animation tutorial. 
Everyone in FNV - Anims or NH Arms who assisted and/or tested this out.

Credits to:
NovaFinch for making the original Fallout 4 mod.
Anton-DDDV for the Base Model.
Infinity Ward for the weapon sounds taken from COD MW.
Joefoxx082's Weapon Animation Replacer for the third person reload animations included in the optional file.

Animations referenced:
COD MW ODEN Anims
EFT ASH-12 Anims