Runes are for early game, Items are for late game. AS runes are practically useless on an AD carry. Saying this as a 1600 AD carry thats currently on a tournament team with all 2ks. (So I'm not some random telling you what to do.) There are some AD's where this isnt completely terrible, but just in general, and for example. I have 3 rune pages for AD (one is super niche and doesnt get much play at all.) So the other two look like this. 9 arpen reds, ad quints, armor yellows, mr blues. OR ad reds, ad quints, armor yellows, mr blues. I use the second one on, Vayne, Sivir, and sometimes Cait. But both work well for all AD's.