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

Laylax Prometheus Non-Linear AEG Airsoft Upgrade Spring MS120 (Emerald) is a performance AEG mainspring designed to bring your build to an MS120 power level (site limits depending), using a non-linear (progressive) coil design for smoother compression and more stable cycling. It's a strong option for skirmishers upgrading a standard AEG for outdoor performance or refreshing a tired spring to restore consistency - when installed and chrono'd correctly.

Tune your AEG properly with the Laylax Prometheus Non-Linear AEG Airsoft Upgrade Spring MS120 (Aqua). The mainspring is the core of an AEG's power output, and Prometheus (Laylax) springs are a popular choice for players who want dependable quality and consistent results. The non-linear spring design uses progressive coil spacing to help deliver smoother compression through the gearbox cycle, supporting stable operation when paired with a well-built setup.

Rated at MS120, this spring is aimed at players who want a noticeable step up in power for outdoor skirmishes, longer engagement distances, or performance-focused builds. Keep in mind that final FPS will vary depending on your cylinder volume, barrel length, air seal, and overall build - so it's essential to chrono after installation to ensure you remain within your site's limits.

Key Features

• Prometheus / Laylax AEG upgrade spring
• MS120 rating for increased power potential (chrono required)
• Non-linear (progressive) coil design for smoother compression and cycling
• Ideal for outdoor skirmish builds and performance upgrades
• Great for restoring consistency in AEGs with worn springs

Specifications

• Brand: Laylax (Prometheus)
• Product Type: AEG upgrade spring (mainspring)
• Rating: MS120
• Colour: Aqua
• Compatibility: Most standard AEG gearboxes