I have this one:
http://airsoft.tiger111hk.com/m88/A&K/p19138/A&K-Full-Metal-SPR-MOD0-AEG-Airsoft-Gun-(Long)/product_info.html
Small review:
http://www.airsoftcanada.com/showthread.php?t=72415
With "vietnam" style mags. I changed the spring, hop up rubber and inner barrel.