I agree with TR. AKs are unique in the way they are designed. Not much can go wrong, they are not that high tech. If you don't have a AR, I would go that route first.
I build my own ARs and AKs. When asked by a friend the difference? I said it is simple look at the armorers kit.
AR:
http://i89.photobucket.com/albums/k2.../ARTollkit.jpg
AK:
http://i89.photobucket.com/albums/k2.../AKtoolkit.jpg
My unfinished Tantal:
http://i89.photobucket.com/albums/k2...475/Tantal.jpg