Features

• Non-linear spring design made of high quality spring steel
• Upgrade spring allows you to custom-tune your AEG's muzzle velocity
• Naming convention follows meters per second (with a 0.20g BB), allowing you to quickly reference how strong a spring should be
• Color-coded for quick reference in a parts bin even if you lose the packaging
• Fits in most gearboxes that accept standard TM-spec springs