M90 Spring

M90 Spring – Airsoft AEG Upgrade Spring The M90 Spring is a standard-power upgrade spring for AEG airsoft rifles, ideal for ensuring reliable performance while keeping muzzle velocity within moderate limits. Designed for consistent ~290-310 FPS (with 0.20 g BBs), it’s a solid choice for balanced indoor or outdoor play. Easy to install for most gearboxes, it provides stable power without over-stressing internal components. Suggested retail price: USD 7–12 Key Features Standard-power AEG spring (M90 rating) Approx. 290–310 FPS output — good balance between power and safety Compatible with most AEG gearboxes Stainless steel / quality metal construction for durability Ideal for general skirmish use, training, or as a safe field-legal spring