FG-Airsoft of France send in this video about the AFS nozzle for you to learn more about it... "Nozzle with Adjustable Flow System (AFS) for GHK AKM and AKMS. The speed of the BBs can be adjusted easily, stably and accurately. Adjustment range measured propane at 20° C with 0.2 g BBs: from 150 to 400 fps (these values are given for information only, and may vary depending of the conditions of use."

It seems that it was immediately snapped up by their customers but then promise that it will be back again for you to buy next week. Click on the image below to go to the product page.