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    ASG ULTIMATE AEG Spring with Progressive Coiling, M125 - Orange

ASG ULTIMATE AEG Spring with Progressive Coiling, M125 - Orange

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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.

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AEG Progressive Spring by ASG ULTIMATE

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.

Installation

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.

ULTIMATE Spring Ratings and Dimensions Table

ModelStiffness (N/mm)Color CodeOuter 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

Key Features

  • Military-grade SiCr spring steel – high strength and durability.
  • Progressive winding – reduces firing stress, gearbox-friendly.
  • Closed and ground ends – improve alignment and spring stability.
  • Factory pre-tensioned – stable power without break-in drop.
  • Black zinc coating – corrosion resistance without friction loss.
  • Color-coded stiffness – quick and easy identification.

Technical Specifications

  • Rating: M125
  • Estimated output after installation: approx. 125 m/s (tested with 6.03 mm – 300 mm barrel)
  • Material: SiCr spring steel
  • Finish: Black zinc coating
  • Winding: Progressive
  • Compatibility: Most AEG gearboxes (except V2.5, L85, PSG-1, and other atypical types)

Package Contents

  • 1× ASG ULTIMATE AEG Spring
ULTIM048
12 Items

Specific References

UPC
12793
EAN13
ULTIM048

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