They are real , in fact fully automatic mil versions have better accuracy because have lower recoil than standard Ak-74s. Civil versions are semis, convert only if you wanna be a part in some local conflict ...
From wikipedia: The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle, first developed in the Soviet Union by Mikhail Kalashnikov. It is officially known as Avtomat Kalashnikova. It is also known as a Kalashnikov, an "AK", or, in Russian slang, Kalash.
The rifle you linked is a real firearm, but it is not a real AK-47. It is a semi-auto AK type rifle, and a very nice one at that. But, when I posted about $15,000 AKs, I was speaking about the real thing.