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.
Caitlyn The Sheriff of Piltover: An amazing champ, I've been playing her since she was released and until recently I've been following some of the top builds here on Mobafire, but with the recent changes with the Doran's Items now being 475 gold I feel starting off withis actually better than getting a Doran's Blade because with the addition of getting Three health potions I find you have a greater survivability in the lane, but I will cover this topic a bit more later on. This is my First real guide so please be kind :P. This is a build I've been finding useful and if you disagree or have suggestions let me know.
Currently I'm using Armor Pen reds, Attack Speed yellow, CD Blues X5 + Attack Speed blues x4, and finally Quintessence of Armor Pen x3. I feel the high Armor Pen and Attack Speed gives you a big advantage of early game harassing. I Mid with this Champ more times then not and I often have first blood within the first few minutes of minions getting there.