Cyma's AK47 Tactical, which comes with a foldable stock.
It may not be a full-metal model (the lower receiver is made of synthetics), yet it feels equally strong and robust.
The AEG has proven to be reliable and suitable for many different scenarios.
It comes at an attractive price-quality ratio and includes a foldable front grip as advertised.
Muzzle Velocity (0.20g): approx. 365 fps (1.25 Joule)