Rocket Airsoft M120 AEG Spring

Rocket Airsoft M120 AEG Spring. Silver type steel, non-linear spring type. One of our most popular airsoft upgrade springs! Very high quality steel made spring to get your gun running just below 400 FPS. Fits in all standard gearboxes. Perfect for M4 upgrades, custom guns, etc. (please note: packaging may be generic or labeled as 'Rocket Airsoft', but is made by SHS OEM).  FPS will be in the 380-400 FPS or so, depending on your gun type.  The M120 is the most popular upgrade spring.  We don't recommend anything higher than the M120 unless you have a specific purpose, as most fields/games won't allow them.