Talk:Corki/@comment-24621775-20160110015642/@comment-10136989-20160112134235

Hybrid pen marks and Flat AD Quints will give you both easy last hitting, and excellent trade damage. Magic pen marks are never worth considering for him, either flat AD or Hybrid, because hybrid gives about 75% of the magic penetration the full mark does. Many mid mages who weave auto attacks into their abilities take Hybrid for this reason.

The Quints should be a choice between multiple things, Attack speed ones are very efficient for the slot, but less so on Corki with his slow base AS. In addition to that most trades will be making use of Q, so boosting that damage by a few % with flat AD or a bit more with Hybrid quints is better. Hybrid quints aren't as good when it comes to straight up autos though.

Another choice to consider is a single lifesteal quint, however since they added masteries for this, it is generally worse, Corki isn't looking to sustain through lane, he is looking to abuse his high base damages and score kills, especially once he can pick up the package.