Rocket Airsoft M110 AEG Spring

Rocket Airsoft M110 AEG Spring. Silver type upgrade spring that is non-linear.  Fits in all gearboxes.  The M110 is a common factory type spring strength to achieve 350 FPS or so out of the box.  We really like this spring for upgrades. (please note: packaging may be generic or labeled as 'Rocket Airsoft', but is made by SHS OEM)