Sorry for downvoting, but there are several reasons:

1) Runes: There are much better runes for Caitlyn! Those Furor Glyphs are just waste!

2) Masteries: Wtf? One point in Ignite and u dont even use it, Havoc is a wasted point, too and the magic pen (u cant even get like this) is another waste!

3) Items: Hextech Gunblade might be a great Item but on her? - No! You might get Manamune but if you have Manaproblems try stop spamming your skills and use them wisely!

4) Love: Totally missing here! :)

i dont like this build

Your masteries are off... you cannot get Archaic Knowledge without all 4 point in Sorcery. Your item build and gameplay sections indicate you play with an afk-autoshot mentality, which is the fastest way to get you killed in high elo / ranked matches because you push your lane too far. Your rune choices do not synergize well, and you use secondary glyphs and seals. -1 for lack of a solid understanding of game mechanics.

This is very true i went more for the lichs bane just for it's cheaper ill try it out in my next time and see how it turns out. (edit) i tried the trinity force in a private game to see the difference and i find that lich bane is still the bread and butter for its unique passive cause if you do the net then trap then your Q when you shoot them while backing off you have that extra damage and if you time it right you get headshot mixed in that. It also is great for taking out turrets since the unique passive works with turrets (i know of this cause of karthus)

instead of lich bane use trinity it scales with ad and it also gives movement speed