I run a skill build and Ive been using the back pack skill 'perfect tech support' (skill kills increase skill damage by 25%). I just got a rifle with 'perfect spike' (headshots grant 25% skill damage for 5 seconds'
Ive tested in the firing range but cant really see a change in damage numbers. Do these skills not stack?? I cant see any indicators in game that says they wont. Im a tad confused.
Cheers :D

