Prometheus Non-Linear Upgrade Spring for Airsoft AEGs (Model: MS110 / Aqua)

Fine-tuning your airsoft AEG to perform exactly how you want it starts at the heart of your gearbox. The Prometheus MS110 Non-Linear Upgrade Spring (Aqua) offers a premium solution for players seeking precision, consistency, and enhanced FPS performance without compromising internal durability. Whether you’re building a reliable outdoor DMR or just pushing your standard AEG to the next level, this spring delivers rock-solid results backed by Prometheus’ industry-leading engineering.

This upgrade spring is part of the renowned Prometheus spring line, known for its durability, consistent compression, and smooth shooting performance. The non-linear design provides a balanced tension curve, meaning the spring compresses more gradually at the start and more tightly toward the end. This reduces stress on your motor and gears during initial compression and improves efficiency and longevity—especially under heavy use.

Constructed from high-grade spring steel, the MS110 is made to withstand the repeated stress of semi- and full-auto firing modes without deforming or losing power. Unlike cheaper linear springs, this upgrade won’t fatigue prematurely, making it a dependable option for serious airsoft enthusiasts.

The MS110 designation means it’s engineered to produce around 110 meters per second (approx. 360 FPS) using a 0.20g BB. This makes it an excellent choice for outdoor fields or for players who want to push their rifle’s velocity just under common field limits. Whether you’re running a Tokyo Marui platform, EMG build, or Matrix AEG, the MS110 is compatible with any standard TM-spec gearbox, making it a drop-in upgrade for countless rifles.

One of the standout features is its color-coded Aqua finish, making it easy to identify among your parts inventory. Even if you misplace the packaging, the color system ensures you’ll never mix it up with other springs. This small but thoughtful touch saves time for techs and players alike—especially when swapping between spring powers for different field rules or loadouts.

Because Prometheus springs follow the meters-per-second naming convention, you can make fast, informed decisions about tuning based on expected output. No more guessing what “M110” means in FPS—just reference the number, and you’re good to go. Of course, actual velocity will vary depending on your gun’s setup, including cylinder volume, barrel length, hop-up pressure, and air seal. But the MS110 provides an incredibly reliable baseline to work from, especially for techs building precise configurations.

Whether you’re upgrading from a stock spring or refining a high-performance rifle, the Prometheus MS110 Non-Linear Spring is a worthy investment. It offers smooth cycling, optimal tension, and long-term durability in a component that often goes overlooked. Backed by Prometheus’ parent company Laylax, a trusted name in Japanese airsoft engineering for over 20 years, this spring is designed with professional-level tolerances and precision manufacturing.

Specifications:

• Model: MS110 (Aqua)

• Approximate Velocity: 360 FPS (0.20g BB)

• Compatibility: Tokyo Marui-spec gearboxes (EMG, Matrix, etc.)

• Material: High-strength spring steel

• Design: Non-linear for enhanced efficiency and reduced wear

• Color: Aqua (for easy identification)

Note: Final FPS may vary depending on barrel length, cylinder volume, hop-up, and internal air seal. Proper installation is key to consistent results.

Take your AEG to the next level with the Prometheus MS110 Upgrade Spring—engineered for players who demand accuracy, power, and reliability.