If you are trying to get your hands on a gauss shotgun in Fallout 76, you will need to seek out Samuel of the Settler's faction. Samuel will sell The gauss shotgun weapon plan for 500 gold bullion.
However, you will also need to have max faction rep and status of ally with the settlers before you can buy the plan. So if you went with the other faction, the raiders, in the wastelander's storyline, you will not be able to purchase the plans from Samuel.
That said, to buy the plans from Samuel, you will need a lot of gold bullion, which is a unique currency player can farm in Fallout 76. You can earn gold bullion from farming treasury notes you get from both daily quests, events and completing the main questline for wastelanders.
Once you got a good chunk of these notes, you can then turn them in at gold press machines at stations and the main settlements of both the raider and settler factions. But you will only be able to turn in a limited amount of notes each day, so you will need to combine the method with others to get more gold.
One such method would be to purchase 50 gold per 1k caps from an NPC called Smiley located at the wayward. Using Smiley can also get you up to 300 gold on top of the 200 you can get from treasury notes. However, it will cost you 6k in caps to even get close to 300 gold.
Because of this, it might be a better idea to simply play the long game and farm gold each day until you get 500 gold for the gauss shotgun weapon plan. That said, once you got the gold, you will be able to get the weapon plan from Samuel. After purchase it, you will be able to craft it via a workbench with the following resources.
- 14 Aluminum
- 8 Wood
- 7 Steel
- 15 Screws
- 2 Legendary Module
- 6 Circuitry
- 4 Silver
- 4 Spring
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