FG-Airsoft GHK AK CNC Steel Hop-Up Chamber with Ball Screws
Adjustment of the trajectory by two ball screws which press directly on the hopup rubber.
Removes 'side spin' problems
Precise and durable adjustment thanks to screw-locking system and temperature-insensitive components (stainless steel balls)
Compatible AEG hopup and barrels
Adjustment key included
This upgrade item is a bit harder to set but once done is very precise and will remain stable for some time.