Product Description
ZCI Tune-Up AEG Main Non-Linear Spring (M120)
The ZCI M120 Tune-Up Main Spring is a steel replacement spring for AEG gearboxes. It uses a non linear, variable pitch design, so the coils are not evenly spaced along the spring. Swapping in a higher rated spring is one of the most common ways to raise an AEG’s velocity, and the M120 is a popular choice for a stronger, higher power build.
At the M120 rating, ZCI’s retailers describe a velocity of roughly 380 to 400 FPS with 0.20g BBs. Your actual result depends on your barrel length, cylinder volume, air seal, hop up, and BB weight, so treat the figure as an estimate.
A stronger spring puts more load on the rest of your gearbox. Make sure your gears, piston, and other parts are built to handle an M120 before you install it, and check your field’s FPS limits so you stay within them. Installing a spring means opening the gearbox, so professional installation is recommended if you are not experienced.
Features
- ZCI M120 main spring for AEG gearboxes
- Steel construction
- Non linear (variable pitch) design
- Increases velocity to roughly 380 to 400 FPS with 0.20g BBs (estimate)
- Tune up part for AEG upgrades and rebuilds
Specifications
- Brand: ZCI
- Type: AEG main spring, non linear (variable pitch)
- Rating: M120
- Material: Steel
- Approximate Velocity: About 380 to 400 FPS with 0.20g BBs (estimate; varies with your setup)