Barrel AK47 mounting

Can you explain me how I can remove a barrel from an AK 47 ? is it screwed or not ?

[zero]

If the weapon is stamped i'm pretty sure it's pinned in, and if it's milled it should be srewed in , i could be wrong though.

[Destroyer]

I heard somewhere that on some models the barrels are screwed AND pinned on. Sorry, don't know which ones.