RA-Tech have made a video review of the GHK AKM GBB:
Hi we are RA TECH.
We took a video review the GHK AKM. In this video, we show you how to assemble the gbb, the way to adjust the hop up, and test the fps and rof. We also show the different between the new magazine and old magazine, and demonstrate the function of magazine switch.[youtube http://www.youtube.com/watch?v=O4JfImf95II&hl=en&hd=1]