I found a nice blueprint for an assault rifle as well as some augments. I researched both, but now I don't see any option to actually apply the augment to the assault rifle.
From the description in-game I would have expected this to happen in the development phase, but there is no option here to add an augment. I can craft the Valkyrie assault rifle I researched here, and I can see the augments in my inventory, but I can't find any option to select an augment here.
So, how do I apply an augment to my weapon?