FG-Airsoft have sent over details of their new AFS nozzles for GHK M4, WA M4 and clones:
New AFS nozzles for GHK M4 and WA M4 and clones
These nozzles allow you to adjust the FPS of your BB gun easily, precisely and give a very stable velocity from 280 to 390 FPS without adding cooldown (these values were measured using 0,2g BB’s, propane gas at 20°C, these values are given for information only and can vary from a BB gun to another).
Velocity adjustment is made without any disassembly, directly through the ejection port.
Nozzles with AFS (Adjustable Flow System) for GHK M4, reference 50021
Product page
Testing video :
Nozzles with AFS (Adjustable Flow System) for WA M4 and clones, reference 50020
Product page
Testing video :
