Have you seen the portals 'New Vegas Items' page and its 'weapons' subpage I dont believe it has weapons from mods.

To attach a weapon mod you must have both the weapon it is intended for and the mod in your inventory. To add them to your inventory, open the command console ( ~) and type player.additem followed by the item code, the quantity you want, and the condition you want it in. Fallout new vegas weapon mod ids ( Updated : Octo) Weapon mods are attached via the Pip-Boy. These are the known codes for the various weapons that can be found and equipped in Fallout 3. An updated, searchable list of all Fallout 4 item codes for all platforms. Player.additem 00020420 1 100 ARMOR ITEM CODES For example, to add one set of Combat Armor in perfect condition, you would type:

The main point of this guide is to be a quick resource of all the item id's in the mod for use with the console command. Adding a pletora of new weapons, mods and ammo to an already buldging weapon selection.

To add them to your inventory, open the command console ( ~) and type player.additem followed by the item code, the quantity you want and the condition you want it in. The Classic Fallout Weapons mod is a mod in which, as you guessed, adds most of the weapoons from Fallout 1,2 and Tactics. These are the known codes for the various armors that can be found and equipped in Fallout 3.

Fallout 3 weapon ids