To utilize an AK magazine the entire magwell area of this rifle would need to be changed. I think PTR91, Inc. has stamping dies for the G3 receiver only, which has a large box profile than any AK due to the different lengths of the cartridges used.
I would have preferred an HK 33 sized receiver, modified slightly to accept the 7.62x39 AR15 magazines. Like I said, though, I don't think that PTR91, Inc. has stamping dies for the smaller HK33 receiver, only the G3 sized receiver.