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Plan: Musket stack monument is a workshop object plan in the Fallout 76 update Steel Dawn.
The plan can only be obtained by opening a second-generation (i.e. Steel Dawn onwards) holiday gift as part of the Holiday Scorched community event.
The plan is not available at any in-game vendors.
This plan unlocks crafting of the musket stack monument at a C.A.M.P. or workshop.