KWA Hop Up Chamber Spring

KWA OEM inner barrel base spring. This spring is needed to ensure the hop up chamber is pressed against the gearbox. Without this installed, your gun will experience massive FPS loss because the hop up chamber will be able to move around and the air nozzle will not seal fully with the hop up bucking.

The inner barrel base spring is used on all models of KWA AEG 2.5 / 2.5+ / 3.0 / 3.0+ AEG's.