Blueprints: Crafting Spec for mods and attachments?

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I can't seem to find any of these. In the Quickhack perk tree you can unlock specs for quickhacks but there is no option to unlock anything on the perk tree of technical ability and vendors don't sell them. How can I get the specs? I have some, like 2 or 3 but they are "common"
 
I can't seem to find any of these. In the Quickhack perk tree you can unlock specs for quickhacks but there is no option to unlock anything on the perk tree of technical ability and vendors don't sell them. How can I get the specs? I have some, like 2 or 3 but they are "common"
You possible have to rest 24 hrs bunch of times to get them like i m trying for LMG schematic which is nowhere to be found!
 
Is there a point in the game when certain schematics spawn?

I got an armadillo schematic on my 1st playthrough but haven't found any on my 2nd, only clothing schemes not mods
 
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