
Unique weapons cannot be equipped with weapon mods, with the exception of the weathered 10mm pistol, the Mercenary's grenade rifle and the holorifle. While in Fallout 3 this was limited to the creation of custom weapons, New Vegas takes this a step further by allowing the creation of weapon variants based on basic weapons by adding weapon mods. One of the features added to New Vegas is the ability to custom modify certain base weapons. Similarly, you may want to go to /r/FalloutMods for more specialized help with specific mods.“ Weapon mods can increase ammunition capacity and damage, reduce spread and weight, or add special equipment like scopes. Ultimately, it is necessary to post your mod list to provide more accurate help than just this. This will usually need to be solved on a case-by-case basis. ini files to make the mod operable on your computer. Of course, the mods may be installed improperly. The famous ENB shader mod provides a toolkit that lets other modders drastically change the visuals of the game - but the default installation doesn't have those changes itself. Check the mods tab of your Mod Manager to make sure that all your relevant mods are turned on.

Installing the mod with a manager may install it in the load order, but leave it disabled.

Make sure your mods are enabled within Vortex. In not done properly you may be clicking on the unedited launcher instead of the modded version of the game. Foundational mods like New Vegas Scrip Extender (NVSE) may modify the launcher in addition to the game itself. Make sure you're starting the game from the correct executable. While the Nexus Mod Manager makes things pretty simple to install mods, the notoriously unreliable game means there's a variety of reasons your mods may not be loading.
