Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is the best way to play Corki in ranked if you're looking to carry through the lower ELOs (1100-1400).
Simple build guide, not going to go into detail with game-play as you should already know.
As for items this is the best way to deal the most amount of damage out of corki.
Switch to mercs if needed. Also build Frozen Malet before you build Ghost blade if you're getting focused.