The Action Army Piano Wire AEG Spring – M150 is a high-power AEG upgrade spring designed for builds that need significantly more spring tension than a standard setup. It is aimed at experienced airsoft players and techs working on reinforced gearboxes, DMR projects or other carefully tuned rifles where a stronger spring is genuinely required.
Piano wire construction is chosen for consistent tension and durability, making this spring a practical choice for custom AEG work where dependable compression matters. In use, an M150 spring places much greater load on the gearbox than lower-rated options, so it is best suited to rifles with the correct internal support rather than basic stock builds.
For UK players, this is not a casual drop-in upgrade. An Action Army M150 spring should only be fitted with full attention to site power limits, gearbox strength and the rest of the drive train. If you are refreshing or building a higher-stress AEG, it makes sense to consider related internals such as gearbox parts, piston assemblies and spring guides at the same time.
For serious AEG tuning, choose the Action Army Piano Wire AEG Spring – M150 with the right supporting parts in place.






