Specna Arms AEG Spring M90 M100

Description

Precision Velocity Control: Specna Arms AEG Upgrade Main Spring (M90 / M100)

Tune your rifle to perfection and nail your local site’s power regulations with absolute confidence. The Specna Arms AEG Main Spring series is engineered for serious players who demand consistent power, smooth cycling, and reliable compression. Manufactured from high-tensile steel wire with precisely spaced coils, these upgrade springs are designed to endure the punishing cycles of high-rate-of-fire builds without losing their tension over time. Whether you are aiming to drop your power for a tight indoor CQB venue or squeeze out maximum legal performance for an outdoor skirmish, these precision-ground springs deliver stable velocity shot after shot.

Available in two distinct power ratings, this listing allows you to select the ideal compression rating for your specific gearbox setup. They work flawlessly with all standard Version 2, Version 3, and quick-change spring guide systems, making them the ultimate plug-and-play upgrade to dial in your rifle’s FPS output.

Key Features & Performance

• Dual Version Availability: Available in two meticulously calibrated options: the lower-powered M90 or the mid-range M100 to suit your power requirements.
• High-Tensile Steel Composition: Manufactured from premium, fatigue-resistant steel wire that undergoes a specialized tempering process to eliminate settling and spring degradation.
• Irregular Pitch Coil Design: Features advanced non-linear coil spacing that reduces initial strain on your motor and gearbox teeth, lowering battery consumption and smoothing out the cycle.
• Precision-Ground Ends: Both ends of the spring are ground perfectly flat to ensure a completely square seat against the piston and spring guide, preventing rotational twist and internal friction.
• Universal AEG Compatibility: Fully compatible with all standard Tokyo Marui spec gearboxes, including V2 (M4/AR-15), V3 (AK/G36), and modern quick-change spring systems.
• Consistent FPS Output: Calibrated to provide an ultra-tight velocity deviation window, helping you achieve excellent consistency across the chronograph.

The “Pro” Take

When it comes to upgrading a gearbox, the spring is the heart of your velocity control. Cheap, generic stock springs tend to fatigue quickly, meaning your rifle might drop 20-30 FPS after just a few thousand rounds. These Specna Arms upgrade springs are a massive step up. The irregular pitch winding is the standout engineering choice here; by clustering the coils tighter at one end, it changes the compression resistance curve. This means your motor doesn’t have to strain anywhere near as hard to get the piston moving, saving your gear teeth from premature wear and giving you a snappier trigger response. They seat perfectly, don’t buckle inside the piston, and hold their rated power over months of heavy usage.

UK Spec & Site Performance

Navigating the strict FPS and Joule limits at British airsoft venues can sometimes be a headache, making these Specna Arms springs a total toolbox essential for UK skirmishers. They are beautifully calibrated to align with typical UK site rules:

• The M90 Version: Typically yields around 290 to 310 FPS (depending on your rifle’s seal and barrel length). This makes it the definitive choice for hitting a completely safe margin at strict 350 FPS maximum indoor CQB sites, or for softening high-speed DSG builds.
• The M100 Version: Generally sits right in the “sweet spot” zone, producing roughly 320 to 340 FPS. This is perfectly optimized to squeeze the maximum legal range and performance out of your primary weapon at open-air UK woodland sites without accidentally tipping over the standard 350 FPS limit.

Friendly FAQ

Which version should I buy to get exactly 330 FPS?
For a standard UK rifle aiming for the 330 FPS mark, the M100 version is generally your best bet. However, please remember that final FPS is highly dependent on your gearbox’s air seal efficiency, inner barrel length, and hop-up settings. If your setup has an incredibly perfect air seal, an M100 might push close to 345 FPS, whereas an M90 will safely keep you under 315 FPS.

Will these springs work with Specna Arms ESA or Enter & Convert quick-change systems?
Yes, absolutely! These springs are fully compatible with Specna’s own ESA (Easy Spring Access) and Enter & Convert quick-change guide systems, as well as any other manufacturer’s quick-change or standard traditional gearbox setups.

Does it matter which way around I install an irregular pitch spring?
Yes, for the smoothest performance, you should always install the spring with the tightly clustered, more compressed coils sliding onto the spring guide rod at the rear of the gearbox, leaving the loosely spaced coils to sit inside the piston head.