Modify instance naming rule thingy Handmade Rifle

[th3overseer]

So, I'm still enough of a gun nerd that the Handmade Rifle from Nuka-World bugs me with it's incredibly incorrect name. I want to change it so that every instance of the gun in the game will spawn with whatever name I deem fit to give it, exactly what this mod http://www.nexusmods.com/fallout4/mods/2318/? does to the vanilla assault rifle. I've asked about this in a few different places, and both times I was told I need to modify something or other with "instance naming rules" or something to that effect. This assumes I'm smarter than I am, because I have no idea what this means, or how to do anything about it. So, please, could someone tell me exactly how to do this with enough detail that an idiot, such as myself, could actually understand?