Installation:
I recommend using NMM or the FO4 Mod manager to install this. However, Manual install instructions are below.
Update
Changed the Ammo of the base to have a normal color scheme instead of straight black. I've also added a GT (Green Tip) ammo designed to simulate an AP (Armor Piercing) round in an NMM friendly format as well as a new RT (Red Tip) ammo variant designed to Simulate an Explosive round.
I highly recommend using a mod the adds the ability to craft legendary mods when using these Ammo variant.