I hated how the Combat Rifle's receiver was pretty much exactly the same as the Combat Shotgun's despite using two different meshes!! This is a very small edit I made to the mesh to make it different from the CSG and more like a traditional Assault Rifle.
Permissions and credits
Author's instructions
If you would like improve the textures or improve the mesh, I'm pretty much guaranteed to give you permission but you must ask for it regardless.
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This author has not credited anyone else in this file
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Outdated, Go here for a new and improved version ---> http://www.nexusmods.com/fallout4/mods/16035/?