The long finned barrel Provides superior range and sighted accuracy and better recoil in exchange for poor hip-fire accuracy. Using this mod gives no accuracy penalty while firing.
The recipe is the same for all weapons for which the mod can be crafted.
Gun Nut (2)
Long finned barrel (1)
Can be crafted on a weapons workbench.
PC Dropped and purchased pipe revolvers consistently come equipped with (bolt-action) instead of (revolver) version. when this happens, the barrel mod menu shows two listings for finned barrel, one with the usual crafting ingredients, the other with a blank ingredient list. [verified]