ULTIMATE – MILSPEC - M135 – Spring Rate 0.943N/mm or 440 fps.
Ultimate Mil-Spec AEG springs are manufactured out of the best steel (SiCr) available for springs. With minimum loss in power and consistency, the Mil-Spec spring series is the ULTIMATE choice for your AEG. The Mil-Spec springs are color coded for better identifying them when switching out the spring for different skirmises.
The springs are designed from the start to deliver the best output while keeping it's coil strength, consistency and quality. With the closed and ground ends, the spring remains in place during use to prevent reduction in ROF due to bending.
Internal gearbox upgrade and replacement parts should only be installed by someone comfortable and familiar with gearboxes. Install at your own risk. If you need an Amped Airsoft Technician to install your internal parts, please send an email to email@example.com