JBU JA48 Steel M150 Spring for Airsoft AEG
Our take:This JBU M150 Airsoft upgrade spring is made for most-all airsoft metal gearbox AEGs.  Constructed of oil-temper steel wire with an irregular pitch, it is one of the best ways to adjust the FPS output of your metal gearbox AEG.  High quality, low price tag. Get more power out of your AEG today!  FPS rating:  420-450 FPS