My take on a classic mod that has been around since Fallout 4. This will allow you to install any mod from any gun on any other gun. Want to make your gun more gun looking with more gun parts from other guns? This will let you, within limitations of course.

An Eon for example cannot install a foregrip. A Cutter cannot install a scope, Cutters in general are buggy. A Magstorm cannot change its receiver. There are a lot of small instances like this, but this is due to the game and meshes themselves, I'm not doing all that, way too much work. For the most part though, you can install scopes and silencers on pistols or a rifle barrel on a Solstice if you want. You can take pretty much any mod that is supported and see it in the list of craftable mods for whatever weapon you are modifying - assuming the weapon allows it.

Bonus - You can change legendary enhancements with this mod as well. There is a lot on this mod I am still working on, a lot, this is very much so complete, but the bonus stuff I am integrating is absolutely WIP. The mod will be fine to install mid game, but your weapons will have quality bugs increasing their damage by a shit ton, I am pretty sure this is all of the quality mods stacking on one another but I'm not 100% sure, only happens if you install mid game, and only for weapons acquired before installing the mod - will not affect new weapons and changing any mod on your weapon will reset the quality to normal.

If you start a new game with this mod it works flawlessly, but is harmless to install mid game. I'd not recommend uninstalling mid game, the game probably won't like you having a Hard Target scope on a Razorback know what I'm saying? Might be fine, haven't tested, I keep the mod installed cause its fun so I didn't need to test.

So all legendary enhancements can be changed and even removed. I have made some new items called a Legendary Core (base item), and Legendary Modules (T1 / T2 / T3). The Legendary Modules are crafted at an industrial bench from 1 / 2 / 3 Legendary Cores according to the tier of legendary you are making. For example, you get an Eon with a T1 and T2 slot then you would need 3 Legendary Cores so you can craft 1 T1 Module and 1 T2 Module. With these modules they can be used as tokens to change the slot enhancement. So you got "Elemental" but want "One Inch Punch" on your T3 slot instead? You need to simple craft a T3 module and head over to a weapon bench, go to the weapon, and it is in the list of T3 enhancements, just choose whatever one you want. This will eat your T3 module and to change it again you need another T3 module.

I have essentially combined a few different mods but had to do it from the ground up cause the integrations that were made between other mods were... not to my standard. This mod does NOT let you change weapon quality/damage. This mod DOES add bonus attachments for this purpose, more to come.

BUG: Weapons placed by default or guarantees like the Eon in the beginning of the game, will be VERY strong and immersion breaking since they take the Common Quality from every base game weapon, or so I believe. The same bug as when you introduce this mod in the middle of a playthrough to your already obtained weapons. I have 2 solutions, but both may not be to everyones' likings. Either remove the damage bonus from better quality weapons (which is what I would do, I think its stupid) or make a set of mods (probably internals) that reduce/increase damage by a flat amount.

-In "Internals" you can find the big rounds internals, this multiplies your damage by a lot, you will instakill anything you shoot, probably. Don't use this if you don't want to, be a grownup. This is mostly used for dev testing but decided to just keep it cause its fun.

You can also find "Legendary Slots" somewhere, think in Internals as well, I am working on a lot of stuff under the hood. This mod does not work, no point in using it. Hoping to make it work one day.

-I have 2 other mods called Dividing Agrome and Rebalanced Legendary Effects. These all work similarly and will need a patch since they touch the same things. I was going to combine all of them but people might not want that, I hate when big mods have great features but I only want some of them. The patch should be out soon, but I am sleepy right now and really don't feel like doing shit, I am just uploading these 3 as is for now.

--------You WILL find mismatched sights and barrels and such, a Lawgiver barrel wasn't made to be on an Eon. I will not fix this, it would be a lot of work.
--------Weapons still spawn in vanilla form, you will not find fucked up guns in the wild.
--------Some cool looking guns can be made, but they keep the base "weapon" like if you make an Eon a sniper rifle, it will still be held and reload like an Eon. There is no fix for this I am looking into.

-----> THIS WILL CONFLICT
                                           WITH MODS THAT EDIT WEAPON ATTACHMENTS
                                                                                                                   OR THE BASEGAME PLAYER WEAPONS <------

I am working on multiple mods that remedy any problems, you shouldn't need any other mods to conflict with this if you install my others when I upload them.

WIP list:

Weapon damage rebalance (no starter/endgame guns, or as extreme as they are at least)

Armor stuff

More legendary enhancements (already partially done) (these will be OP intentionally... in reason of course)

Rebalanced legendary effects (weapons are already finished, just need to upload and patch)

Dividing Agrome/Buff to Cutter (Mostly done, awaiting upload and updating and patching)

Other stuff