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).
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The spring is a fundamental part of the gearbox because its strength, along with the air seal, affects the overall performance of the rifle. Low-quality springs, although they often have above-average performance compared to their rated value, quickly lose their stiffness, shorten, or in extreme cases, can break (due to storing the rifle with a compressed spring or in a pre-cocked state).
From the workshop of Retro Arms, famous for their quality CNC gearboxes, comes another finely tuned upgrade part: a high-quality spring made from valve wire alloyed with silicon and chromium (SiCr) that retains its stiffness after thousands of shots and does not deform.
Progressive (variable) winding makes the compression easier in the first phase of the piston movement while not reducing the performance. The outer diameter of the spring is 14.5 mm.
The rated value of M120 corresponds to a speed of 120 m/s with an average barrel length. With a good air seal or a longer barrel, the performance will be higher.
When installing a spring with progressive winding, the compressed part (where the coils are closer together) goes on the spring guide. Retro Arms marked this spot with color for easy identification of the spring strength (see below).
Data sheet
Specific References
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.
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.
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.
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.
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 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 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.
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 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.
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.
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.
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