175 metal fragments and two pipes at a Level 1 bench. The fragments are one furnace run; the pipes have to be found, since nobody crafts them that early.
Your first evening's double barrel is decided in the road barrels, not at the furnace. Metal pipes need a Level 3 bench to craft, so the calculator counts them as is, and on day one every pipe is one you cracked out of a barrel or a crate. Pick up each one you pass while farming. A pair is a gun.
The blueprint is cheap even by Level 1 workbench standards, so a fresh group often learns it early, and the fragments come with any load of ore.
Watch out
Don't feed a spare double barrel to the recycler expecting both pipes back. The ordinary one returns a single pipe and about half the fragments.
No pipes at all? A waterpipe takes none and still wins a doorway, one shell at a time. And once a Level 2 bench stands, the pump shotgun's craft keeps the same two pipes, swapping the fragments for high quality metal and a spring.
Questions
Double Barrel Shotgun ×10: how many resources?
Metal Fragments ×1,750, Metal Pipe ×20.
Which workbench does Double Barrel Shotgun need?
Workbench level 1.
How long does Double Barrel Shotgun take to craft?
15 s for one, every step included.
How much scrap does researching Double Barrel Shotgun take?
