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ACM M140 AEG Spring (SP140)
Upgrade your electric rifle's output with the ACM M140 AEG Main Spring (SP140). Specially designed for custom airsoft builds requiring boosted muzzle velocity and extended engagement distances, this high-tensile steel upgrade spring offers reliable compression and structural durability. Built to resist tension decay, the precision-wound design prevents power drop-off over extended skirmish use. Featuring ground-flat ends, the spring rotates smoothly against your bearing spring guide and piston head to reduce friction. An excellent option for airsoft technicians building high-power AEGs or dedicated DMR setups requiring consistent velocity and long-range accuracy.
Achieving long-range accuracy and extended engagement distance requires consistent muzzle energy and reliable linear power output. The ACM M140 AEG Main Spring (SP140) provides a heavy-duty compression platform engineered to maximize rifle range and isolate power delivery across high-output gearbox builds.
High-Tensile Steel Construction & Power Retention
Manufactured from heat-treated steel wire, this main spring maintains high structural integrity under continuous compression cycles. The fatigue-resistant alloy prevents linear power decay over extended use, ensuring your muzzle velocity remains predictable throughout long outdoor skirmishes. Designed with ground-flat ends, the spring sits completely flush against internal contact points to minimize axial friction during rapid compression and release.
Enhanced Distance & Heavy BB Performance
Upgrading to an M140 rating increases cylinder air displacement pressure, allowing your rifle to propel heavier weight BBs with flat, stable trajectories. Expect output levels between 440 FPS and 470 FPS (measured with 0.20g BBs) depending on air seal quality, barrel length, and cylinder ratios. This makes it an ideal core upgrade for DMR (Designated Marksman Rifle) configurations designed to dominate open field lanes.
Key Features & Technical Benefits:
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High-Tensile Steel Alloy: Resists compression set and maintains long-term tension consistency.
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Precision Ground Flat Ends: Ensures level seating on spring guides and piston heads to reduce mechanical binding.
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High-Velocity Output: Delivers expected performance between 440 and 470 FPS for boosted effective range.
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Universal Gearbox Fit: Compatible with standard Version 2, 3, 6, and 7 electric airsoft gearboxes.
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Optimized for Heavy BBs: Provides the air compression needed to lift 0.36g–0.40g BBs smoothly.
Tech Installation & Usage Guidance
When installing high-tension main springs, ensure your gearbox shell is radiused at the cylinder corners to distribute stress evenly. We strongly recommend pairing the M140 spring with a high-torque motor, full steel-tooth piston, reinforced gearset, and a metal spring guide with ball bearings to prevent binding and protect internal drive components from excessive mechanical load.
| SKU | 614232 |
|---|---|
| Brand | Double Bell |
| Weapon Category | Parts |
| Recoil | No |
| Shell Ejecting | No |
| FPS | 401 - 500 |
| 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.