I found out this while my friend boosted me through SM, i dinged 37 (yay) I could equip my Ravager! But, i had nada skill :< So i went melee and dident get fast skill, so i did Raptor strike, but it has 6sec cooldown.
Then i tried with Wing clip, and YES! I got skill!
So if you need weapon skill, put the wep in Mainhand and then spam Wingclip
Hope this will be usefull to someone At least it will be for me
EDIT: Edited some typos