AEG M120 IR Upgrade Spring | Lancer Tactical

AEG M120 IR Upgrade spring | Lancer Tactical

This upgrade spring is the heart of your AEG gearbox and directly determines the FPS output of your replica. An airsoft upgrade spring like this M120 delivers consistent force to your piston and ensures reliable performance during skirmishes. You replace your main spring when you need more power for outdoor fields or when your current spring weakens after prolonged use.

Technical specifications

This M120 spring is manufactured from anodised stainless steel piano wire with a non-linear design. This reduces stress on your gearbox during piston compression. The black finish is characteristic of this material. The M120 classification indicates an expected output of approximately 400 FPS with 0.20g BBs, depending on your complete setup.

Compatibility and application

This spring fits all standard AEG gearbox versions - whether you have a V2, V3 or other variant. The universal sizing makes this spring suitable for builds where you want to increase FPS to M120 level. For installation you must be able to open your gearbox and correctly fit the spring together with your spring guide and piston. Technical experience with gearbox maintenance is essential.

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