Laylax Prometheus Non-Linear AEG Upgrade Spring MS90

Elevate your gearbox efficiency, protect internal components from excessive strain, and achieve rock-solid FPS consistency with the Laylax Prometheus Non-Linear AEG Upgrade Spring MS90! Precision-manufactured in Japan under Laylax's industry-leading Prometheus line, this non-linear main spring is an essential upgrade for airsoft technicians and players looking to fine-tune their Automatic Electric Gun (AEG) power output.

Advanced Non-Linear Variable Pitch Architecture Traditional linear springs feature evenly spaced coils, which create high initial resistance the moment the sector gear engages the piston rack. In contrast, the Laylax Prometheus Non-Linear spring utilizes a variable-pitch coil pattern with tight spacing at one end and wider spacing at the other. This non-linear geometry provides progressive compression resistance: the motor encounters less resistance at the start of the stroke, significantly lowering peak electrical amp draw, heat buildup, and strain on the motor and bevel gear. As the cycle completes, the spring stores maximum kinetic energy, releasing it instantly for consistent velocity output.

High-Tensile Japanese Steel & Stress Relief Treatment Milled from high-grade Japanese steel wire, each Prometheus spring undergoes a specialized heat treatment and stress-relieving process. This prevents the spring from suffering structural fatigue or losing length over thousands of cycles, ensuring your rifle maintains its target FPS over long periods of field use. The smooth, ground spring ends seat flush against your spring guide and piston head bearings to prevent spring twist, bucking, and lateral cylinder friction.

Targeted MS90 Velocity Profile The "MS90" designation represents a mid-range power output tailored for fields with strict velocity caps, indoor CQB arenas, or platforms requiring a smooth, high-rate-of-fire (ROF) setup. When paired with standard barrel lengths and proper air seals, the MS90 spring delivers predictable, compliant power without over-stressing your gearbox shell.

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 performing routine maintenance, building a high-speed CQB setup, or upgrading for smoother cycle execution, the Laylax Prometheus Non-Linear AEG Upgrade Spring MS90 provides the precision Japanese engineering required for peak AEG reliability.

Tech Tip: For the best results, pair this spring with a ball-bearing spring guide and ball-bearing piston head to eliminate spring torsion.