SP120 AEG Tune Up Spring | Guarder

Guarder SP120 AEG Tune Up Spring – spring for your replica

This spring is the heart of your AEG's power output and directly determines the FPS of your replica. The SP120 from Guarder delivers approximately 390-450 FPS, depending on your gearbox setup and air seal. You replace the main spring when you want to adjust the muzzle velocity for different field limits or when your current spring shows signs of fatigue. An AEG upgrade spring like this is the most direct way to adjust your replica's performance.

Technical specifications

The SP120 spring is manufactured from high-quality spring steel with a black finish. This M120 rating means the spring delivers 120% of the standard spring force. The spring has a universal diameter that fits virtually all AEG gearboxes, from Version 2 to Version 7. The weight and coils are optimised for consistent compression without excessive stress on your gearset.

Compatibility and application

This tune up spring is designed for AEG replicas with a standard cylinder setup. The spring fits all common gearbox versions and is compatible with both standard and reinforced spring guides. Installation requires gearbox experience – you must be able to open the gearbox and reassemble it safely. When using this M120 spring, we recommend a reinforced piston and possibly upgraded gears for long-term reliability.

Ready to add the Guarder SP120 AEG Tune Up Spring to your setup?