I noticed that when I approached a shop, I can sell my upgrades. My question is, if I have more than one of the same upgrade - are these dupes... or compounded? An example:
Recoil Damper II - According to my upgrades interface, this adds +12% weapon stability. If I've acquired x3 of these Recoil Damper II, does that mean I've increased my weapon stability by 36%, or is each acquisition only available once - and therefore I can sell the "duplicates" and get paid?