Sounds about like what I do.

It's good.

Although instead of using clarity I use exhaust

Yeah, but AP AoE Corki is good all game. Physical Corki is only good end game after he is stacked - and even then I doubt the steady damage from gatling (1-trick pony much?) is comparable to his other skills pumped up with AP.

If you had to have some physical damage in your build which is beyond me atleast get Trinity Force or something.

Focusing damage to buff one of Corki's 4 awesome skills just makes little sense especially when you could be playing a better range carry that uses all their skills to synergize with damage.

It's kind of like going DPS Kassius. You could do it but why?

I've tried AP corki, but found it didn't work as well for me. AP teemo > AP corki IMHO.

I often go something like:
sapphire + 2 health pots
sheen
zerk boots
phage --> zeal --> trinity force
B.F. sword --> Infinity
malady or executioners or defense item.

i don't often make it past infinity, they game is normally decided either way by then.

one reason i don't like AP corki is that I feel he scales much worse than other nukers overall. once i see a good corki run AP, i'll change my mind, but i haven't run into any that were effective for their team.

New here? I don't know who Kassius is but theres no way you just compared a Atk based Corki to an Atk based Karthus or Kassadin.

These are Corki's AP coefficients:

Phosphorus Bomb 0.5
Valkyrie 0.4
Missle Barrage 0.3

Those are some of the lowest of any hybrid champion. It takes 333 AP to just get 100 more damage to a missile and that's obviously before MR. You're realistically looking at 60-70 added damage even with some MR pen. His AP ratios for PBomb and Valk are slightly higher but those are situational abilities that are used to escape and protect as much as they are to kill.

After Corki's AP coefficients were nerfed like 3 patches ago, his highest damage ability definitely switched over to Gatling Gun. That's whats shredding people in team fights. You also are forgetting his passive and how powerful true damage is in this game.

Its not that a Atk based Corki doesn't rely on his AP based abilities to do damage. Its just very inefficient to try and increase their damage as opposed to his auto attack and GG damage.

I agree with pigsticker. AP Corki will lose 100% of the time to an attack damage Corki. He will also have a much harder time taking down high HP targets and pumping out sustained DPS.

I find that the best Corki build is straight damage. I like to get 2-3 bloodthirsters on him if the game lasts long enough since these are the highest damage items in game. Infinity edge isn't a bad choice either.

When I first started playing Corki I went with hybrid builds. While I still won, I wasn't dominating. Then I swticed to pure DPS and I went something like 12 games in a row without a loss with him. Since then I have tried going back to Hybrid/AP builds and found them to be very weak. Here is my item progression.

Meki Pendant + 2 HP pots
Chalice + Vampiric Scepter + lvl 1 boots + whatever pots I can afford
BF sword
Bloodthirster + Beserker boots
Start building more bloodthirsters or a banshees veil if the other team has a lot of disables.