Laylax Prometheus Non-Linear AEG Upgrade Spring MS120 (Emerald)

Elevate your gearbox compression, achieve higher muzzle velocities, and protect your electrical system from peak draw spikes with the Laylax Prometheus Non-Linear AEG Upgrade Spring MS120 (Emerald)! Precision-manufactured in Japan under Laylax's industry-leading Prometheus upgrade label, this non-linear main spring is an essential component for airsoft technicians and players looking to fine-tune their Automatic Electric Gun (AEG) for long-range engagements.

Advanced Non-Linear Variable Pitch Architecture Traditional linear springs feature uniform coil spacing, which places an intense mechanical load on the motor and gears from the very start of the cycle. The Laylax Prometheus Non-Linear spring utilizes a variable-pitch coil configuration with tight spacing at one end and wider spacing at the other. This progressive design provides lower initial resistance during the piston draw, significantly reducing peak electrical amp draw, motor heat, and stress on the gearset. Once fully compressed, the spring releases maximum stored energy instantly, ensuring consistent, high-velocity output.

High-Tensile Steel & Color-Coded Identification Milled from high-grade Japanese steel wire, each Prometheus spring undergoes a specialized heat treatment and stress-relieving process. This treatment prevents spring sag, structural fatigue, or tension degradation over thousands of cycles, keeping your FPS stable over extended field use. The ground spring ends sit perfectly flush against spring guides and piston head bearings to prevent spring bind and lateral cylinder friction. The vibrant emerald coating allows for immediate identification of the MS120 rating on your workbench.

Targeted MS120 Power Profile The "MS120" designation provides a high-power output target optimized for outdoor field play, DMR builds, or long-barrel carbines where increased velocity and heavy BB lift are required. When paired with a tightbore barrel and proper air seal components, the MS120 delivers strong downrange power while maintaining a smooth mechanical cycle.

Universal Compatibility for AEG Gearbox Systems Designed for broad compatibility across the airsoft spectrum, this main spring fits standard Version 2, Version 3, Version 6, and other AEG gearboxes utilizing standard-length main springs.

Whether you are building a dedicated outdoor marksman platform or upgrading your primary rifle for superior range, the Laylax Prometheus Non-Linear AEG Upgrade Spring MS120 (Emerald) delivers the precision Japanese engineering required for high-velocity reliability.

Tech Tip: When installing an MS120 or higher, we recommend using a ball-bearing spring guide to prevent spring kinking and ensure a smooth, linear power delivery.