Hephaestus just uploaded a video showing the installation of their recently released Folding Stock Adapter for AK Airsoft guns. This stock adapter has a 6-position extension with storage compartment and is made of CNC'd aluminium. Installing this will allow you install other types of stocks such as the M4 stocks. This is suitable for GHK/LCT AK-105/AK-74M/AKS-74U series, with or without side rail.
In stock at Bunny Workshop right now is what many airsoft players have been waiting for to install on their AK gas blowback rifles. The Hephaestus Folding Stock Adapter is a 6-position stock adapter especially made for the GHK/LCT AK-105/AK-74M/AKS-74U series.