Buy now and Pay Later!
+44 (0) 1543 397 397
All items in Stock & Ready to Ship
ACM M90 AEG Spring (SP90)
Ensure your rifle complies with indoor and close-quarters site limits using the ACM M90 AEG Spring (SP90). Built for players seeking a reliable, low-velocity setup, this high-quality steel main spring provides smooth linear compression and uniform energy release. The precision-wound coil layout resists compression fatigue over time, maintaining consistent output without sagging during long skirmish days. Both ends feature ground-flat ends to eliminate torsional binding against your piston head and bearing spring guide. An essential gearbox part for CQB builds or tuning imported rifles down to legal UK site limits.
Tuning your airsoft rifle to meet strict site power limits requires precise spring tension and consistent linear output. The ACM M90 AEG Spring (SP90) is engineered to provide a soft yet durable compression cycle, making it the perfect replacement spring for indoor skirmishing, CQB setups, or reducing the muzzle velocity of high-powered stock AEGs.
Quality Steel Construction & Smooth Compression
Crafted from high-tensile, heat-treated steel wire, the SP90 spring is built to endure rapid cycling without suffering power decay or structural deformation. Featuring ground-flat ends, the spring sits completely flush against both the internal piston face and the spring guide. This design allows unhindered axial rotation during piston compression and release, significantly reducing mechanical friction, minimizing axial torque, and prolonging the life of your gearbox internals.
CQB & Indoor Skirmish Performance
Installing an M90 main spring lowers air cylinder displacement pressure, making it easy to dial in your gun to conservative velocity requirements. In setups with optimal air seal efficiency, an M90 spring typically produces between 280 FPS and 300 FPS when using 0.20g BBs. Because it places minimal load on the motor and battery, it also helps increase rate of fire and extend battery runtime during intense close-range engagements.
Key Features & Technical Benefits:
-
High-Tensile Steel Wire: Resists compression set and preserves spring length over extended use.
-
Precision Ground Flat Ends: Minimizes axial friction and internal binding against gearbox components.
-
CQB-Optimized Velocity: Delivers an expected performance range of 280 to 300 FPS on 0.20g BBs.
-
Universal Gearbox Fit: Fully compatible with standard Version 2, Version 3, Version 6, and Version 7 gearboxes.
-
Reduced Gearbox Wear: Exerts lower tension on the motor, gears, and piston assembly to prolong internal component lifespan.
Tech Installation & Usage Guidance
The ACM M90 spring is ideal for indoor arenas where strict 350 FPS or sub-1-Joule rules are enforced. For optimal results, check your piston o-ring and hop-up rubber seal to ensure consistent compression. Pair with a metal bearing spring guide to allow the spring to compress smoothly without binding inside the cylinder.
| SKU | 613200 |
|---|---|
| Brand | Double Bell |
| Weapon Category | Parts |
| Recoil | No |
| Shell Ejecting | No |
| FPS | 201 - 300 |
| Spring Type | AEG |
Our courier partners deliver from Monday to Friday, excluding Bank Holidays. We will attempt to dispatch all packages within 24 hours, although at peak times this may take slightly longer. Orders with products with two-tone service or Defence Check may take longer to dispatch.
Once the order is dispatched you will get an email with the tracking number and which courier partner it’s going to be delivered via. Any missing/incorrect items need to be reported with 48hrs of signed delivery.
Click Here to Download the Returns Form (PDF Format)
Faulty Product?! Unfortunately that is part of life but be rest assured we are here to help! Contact one of our friendly staff via phone or email. Stating what the problem is, if we can resolve the problem via phone or email great if not then they will advise how to send it back and what details we require.
The gun will be sprayed 51% in a bright/primary color (we do only blue, green and red currently). The process of two toning currently runs at 2 working days depending on Drying Time, which is effected by Ambient Temperature and Weather. and currently no express delivery is available for this even if you select it at checkout.