ASG Ultimate Upgrade AEG Spring, Red, M135

ASG's Ultimate AEG Springs offer top-tier performance upgrades to airsoft AEGs.

Features:

• MILSPEC SiCr Steel Springs are the best of the best materials available
• Progressive coiling offers a smooth and soft start when being put under tension which reduces stresso n the gearbox internals
• Closed & Grinded ends minimize potential bending of the spring under tension
• Pre-compressed springs straight from the factory greatly reduce break-in periods of the spring after installation
• Black zinc plating protects from corrosion
• Springs with M-Ratings between other common spring brands allowing for much finer tuning of desired FPS 
• Color coding on the springs allow for fast and easy identification to each spring type
• Blue = M95, Springrate 0.447N/mm
• Green = M105, Springrate 0.467N/mm
• Yellow = M115, Springrate 0.519N/mm
• Orange = M125, Springrate 0.826N/mm
• Red = M135, Springrate 0.943N/mm