GamesRPGFalloutFallout 4Fallout 4 When Pigs Fly walkthroughWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. GamesRPGFalloutFallout 4Fallout 4 When Pigs Fly walkthroughWhen you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. (Image credit: Bethesda) Jump to:Investigate the Merchant WorkshopVisit the competing merchant workshopFind Marvin and retrieve the schematics Jump to:Investigate the Merchant WorkshopVisit the competing merchant workshopFind Marvin and retrieve the schematics The Fallout 4 When Pigs Fly mission starts as soon as you leave the vault and sends you to investigate a merchant’s workshop. Finishing it involves meeting some weapons merchants and killing a lot of people but the reward for all that bloodshed is two legendary grenade launcher weapons that will make all …