AEG Progressive Spring M125 by ASG ULTIMATE with orange marking.
Color-coded stiffness for easy identification.
Ideal for airsoft gun upgrades.
Made from military-grade SiCr spring steel.
Progressive winding for smoother startup and reduced strain on gears and motor.
Guarantee safe & secure checkout
The spring is a key component of the gearbox as its strength—combined with air seal quality—determines the gun's overall performance. Low-quality springs may offer higher-than-rated output at first, but quickly lose tension, shorten, or even break—especially when stored compressed or used with pre-cocking systems.
The ULTIMATE upgrade spring from ASG is engineered for maximum consistency and durability. Manufactured from high-quality SiCr spring steel (silicon-chrome), it meets military specs and withstands wear, even under high rates of fire.
The progressive winding design starts softer and builds up, reducing stress on the gearbox and motor. Both ends are closed and ground for stability and a secure fit. Each spring is factory pre-tensioned to minimize initial power drop. The black zinc coating protects against corrosion without affecting performance.
When installing a progressive spring, the tighter-wound end (with denser coils) goes onto the spring guide. The colored-marked end by ASG ULTIMATE goes into the piston.
| Model | Stiffness (N/mm) | Color Code | Outer Diameter (OD) | Inner Diameter (ID) | Length (mm) |
|---|---|---|---|---|---|
| M95 | 0.447 | Blue | 14 mm | 11 mm | 176 mm |
| M105 | 0.467 | Green | 14 mm | 11 mm | 189 mm |
| M115 | 0.519 | Yellow | 14 mm | 11 mm | 188 mm |
| M125 | 0.826 | Orange | 14 mm | 11 mm | 168 mm |
| M135 | 0.943 | Red | 14 mm | 11 mm | 178 mm |
Data sheet
Specific References
BOOST 30000 Upgrade AEG Motor by ASG ULTIMATE.
High-performance motor with 30,000 rpm.
Long axis for M4, HK416, SR-25, and other rifles.
Great value-performance ratio for maximum reliability and power.
Increases rate of fire and saves battery life.
4UANTUM SMOOTH universal lubrication pen from 4UAD with red lubricant.
Specially developed for AEG, GBB, and HPA airsoft weapons.
Suitable for plastic and rubber parts without risk of material degradation.
Rotating applicator for easy application and convenient portability.
Keep it smooth, keep it shooting – don't let your gears run dry!
Retro Arms has come out with another piece that helps you build an upgraded beast exactly to your specifications.
A quality spring of standard length with progressive winding for AEG gearboxes, rated at M120.
Progressive (variable) winding makes the spring easier to compress.
Made from valve wire alloyed with silicon and chromium (SiCr).
AEG PIANO Spring with Progressive Coil by Action Army – Strength of M120.
Suitable for airsoft gun upgrades.
Made from spring steel Piano Wire.
Progressive winding for gentler startup and reduced stress on gears and motor.
AEG Progressive Spring M135 by ASG ULTIMATE with red marking.
Color-coded stiffness for easy identification.
Ideal for airsoft gun upgrades.
Made from military-grade SiCr spring steel.
Progressive winding for smoother startup and reduced strain on gears and motor.
Guarder Progressive Spring for AEG with a stiffness of SP110 (M110).
Offers performance of 104 - 110 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
Guarder Progressive Spring for AEG with a stiffness of SP100 (M100).
Offers performance of 98 - 104 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
Guarder Progressive Spring for AEG with a stiffness of SP120 (M120).
Offers performance of 113 - 122 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
Retro Arms has come out with another piece that helps you build an upgraded beast exactly to your specifications.
A quality spring of standard length with progressive winding for AEG gearboxes, rated at M130.
Progressive (variable) winding makes the spring easier to compress.
Made from valve wire alloyed with silicon and chromium (SiCr).
Guarder Progressive Spring for AEG with a stiffness of SP150 (M150).
Offers performance of 143 - 152 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
AEG Progressive Spring M115 by ASG ULTIMATE with yellow marking.
Color-coded stiffness for easy identification.
Ideal for airsoft gun upgrades.
Made from military-grade SiCr spring steel.
Progressive winding for smoother startup and reduced strain on gears and motor.
Guarder Progressive Spring for AEG with a stiffness of SP140 (M140).
Offers performance of 134 - 143 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
Guarder Progressive Spring for AEG with a stiffness of SP130 (M130).
Offers performance of 122 - 131 m/s.
Made from tempered Si-Cr wire.
Progressive (irregular) winding of the spring eases compression in the initial phase.
Performance consistency even after thousands of shots.
Fits standard TM AEG gearboxes and manual SVDs.
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