Solink M90 Stainless Steel AEG Spring

The M90 is the lightest spring most players reach for. You'll use it as a stock replacement, a detune for indoor fields, or when gearbox longevity matters more than pushing the chrono number.

Rated 280–340 FPS on 0.20g BBs. That range is typical across different setups — the same spring in a different barrel length, cylinder, or air seal gives a different number — but it lands comfortably inside most indoor field caps. A lighter spring means less stress on your gears, piston, motor and battery. If you're running 7.4V NiMH or just want a gearbox that runs quiet and lasts, the M90 is the honest choice.

Stainless steel, the standard material for airsoft springs. The spec says it fits all AEG gearbox versions, and it does — spring length is what you match, not shell type. That said, swapping it on a Version 2 gearbox means splitting the shell; there's no quick-change guide on that platform. A Version 3 lets you pull it through the back.

Field limits are enforced on measured velocity, not on what the spring is called. Chrono with your own BBs before your first game.