Asura Dynamics SRW Style Folding Stock for All Folding AK AEG / GBBR
That turns your standard folding ak stock (PP-19-01, AKS74U, AK105, AKS74, AK74mn) into a folding buffer tube that accepts m4  buttstocks that can also be folded.
This would adapt to AK AEG / GBBR receivers.