MAK2 AK to M4 Folding Stock Adapter Upgrade of the original AK stock
Buffer Tube Adapter for 4.5mm Folding AKs - JMac Customs LLC
Dytac Rifle Dynamics Licensed AK to M4 Stock Adaptor for Tokyo Marui AKM GBBR Series Airsoft Rifles (Model: No Attachments), Accessories & Parts, Gas Gun Parts, Gas Rifle Buffer Tubes & Parts -