This guide will tell you where to farm for Barrel Diffusion in Warframe, and you have to follow the simple steps to farm it.
Barrel Diffusion drops as a C rotation reward in the dark sector defense missions.
It is recommended to bring frames that are either good at defense or can quickly wipe the ma/ kill many enemies. These frames are Saryn, Gara, Frost, and Octavia.
To get the C rotation reward and have a chance at getting Barrel Diffusion, you will need to have to stay until at least round 20 before extracting. You can also kill normal grineer since they have a low chance of dropping the mod.
It may take you a few runs before the mod drops for you.
