I will say though despite not having experience with that adapter, adapters typically can be a real PITA. Sometimes they just give you feed issues, sometimes other problems etc. I've used them on a few guns not AK to M4, but G36 to M4 and had nothing but trouble.
So for the $40, I'd just spend it on AK mags rather than trying to adapt to another platform, just my 2 cents.
Luke