A double barrel in frontier dress: no blueprint of its own, so you craft the double barrel and pick this look if you own it. Fragments and two pipes, as ever.
Nothing on this page differs from the double barrel's craft, because that is the craft. The Blunderbuss has no blueprint and no research cost of its own: learn the double barrel, and if you own the Frontiersman Pack, pick the flared frontier look at the bench. Underneath sits the same bill, a pile of metal fragments and two metal pipes.
So plan it the way you plan the double barrel. On the first day the pipes are the hard part, because nobody crafts them before Level 3, while the fragments come out of any furnace run.
Already holding a plain double barrel? A repair bench puts the skin on it. Reload, shells and damage stay the double barrel's.
