Prometheus MS100 Non-Linear Upgrade Spring for Airsoft AEGs (Gold) – Consistent Power and Precision Engineering

Looking to increase your AEG’s performance without sacrificing reliability? The Prometheus MS100 Non-Linear Upgrade Spring is the perfect balance of power and precision for players seeking an estimated 325 FPS velocity using a 0.20g BB. Built by Laylax, one of Japan’s most trusted names in airsoft engineering, this high-performance spring is part of the Prometheus series—known across the airsoft community for outstanding consistency and durability.

High-Quality Build for Consistent Output

Constructed from premium spring steel, the MS100 spring offers excellent resilience and longevity. The non-linear coil design provides smoother compression and reduced strain on your gearbox. This design ensures better cycling, reduced wear and tear, and less mechanical stress during rapid semi-auto or full-auto fire.

Unlike traditional linear springs, a non-linear spring like the MS100 starts with a gentler compression rate that gradually increases—helping minimize initial shock on your gears and motor. This results in improved trigger response and more consistent shot-to-shot FPS over time.

Easy Tuning and Installation

The MS100 (Gold) spring is designed for compatibility with most Tokyo Marui-spec gearboxes, including platforms from EMG, Matrix, Classic Army, CYMA, and more. Whether you're building from scratch or replacing a worn-out spring, this drop-in upgrade is a straightforward choice for any AEG technician or experienced DIY airsoft player.

Thanks to its color-coded finish, identifying the spring’s power rating is quick and easy—even if you’ve lost the packaging. Prometheus’ naming convention follows the metric system, so “MS100” equates to roughly 100 meters per second, or 325 FPS with 0.20g BBs—perfect for outdoor games or standard field limits.

Tune Your Gearbox with Confidence

Installing an upgrade spring like the MS100 allows players to fine-tune their airsoft rifle’s muzzle velocity without needing a full internal overhaul. Whether you're prepping for Milsim events, skirmishes, or local field restrictions, having the ability to tweak your FPS gives you greater flexibility and ensures compliance with chrono limits.

Because spring power affects the overall performance and efficiency of your AEG, pairing the MS100 with a properly matched piston, cylinder, and hop-up system can yield noticeable improvements in range, accuracy, and durability. Just remember that actual FPS results may vary based on your gun’s configuration—barrel length, cylinder volume, and seal quality all play a role.

Built by Laylax – Trusted Worldwide

Laylax has been crafting high-performance airsoft parts for over two decades, setting the gold standard in Japanese manufacturing excellence. From their Prometheus inner barrels to EG Hard gears and springs like the MS100, Laylax continues to dominate the upgrade market with tight tolerances and engineering precision.

Their parts are trusted by players around the world for reliability under pressure, whether you’re a casual weekend warrior or a competitive airsoft technician.

Key Features:

• Approx. 325 FPS output with 0.20g BBs

• Non-linear spring design for smoother compression

• Made from high-grade steel for long-term durability

• Color-coded (Gold) for easy identification

• Compatible with most TM-spec AEG gearboxes

• Ideal for outdoor field play and custom tuning

Take control of your AEG’s performance with the Prometheus MS100 Spring—a smart upgrade that delivers consistent power, reduced gearbox stress, and trusted Laylax quality in every shot. Whether you're optimizing a custom build or replacing a worn-out spring, this is a reliable choice for serious airsoft players.