I have seen several versions of blowback AKs using the 2xtm magwell sold by Lichtenberg. Both 9mm and 7.62x25 and both using drums. I have seen one other that removed the magwell from a PPS-43 and used the stick mags.
Here is link for a project done before Lichtenburg made a magwell for the 7.62x25.
The AK Files Forums - 7.62x25 Drum-fed about to begin
I will send more links when I can find them.