Check the listing for details. Action Army A06-006 AEG Upgrade Airsoft Spring M150 for KWA G&G ICS JG ECHO1. Condition: New. Listed at 14.00 USD. This item is made for Airsoft only (Made in Taiwan) The Action Army springs are providing all the features you are looking for in an AEG spring for maximum performance. It is made out of high quality anodized piano wire, with tension carefully measured. Systema's irregular pitch, Prometheus's Stainless steel material and PDI's durability are all features duplicated and found in a Action Army spring. This spring will last you longer, is more durable and will out perform! Features: Variable Tension. Reduces stress, wear and tear for your Gearbox. Upgrade your AEG's fps: 450~490 FPS Strength: Made out of Stainless Steel. Increased tension and durability. Tension lasts 50% longer than other leading brands. Compatibility: Designed for all version Airsoft AEG gearboxes. Disclaimer for accessories and parts Professional installation is recommended/may be required. We are not responsible for any damage that may occur. For best results, please have a professional airsoft Tech install all upgrade components at a certified professional airsoft technician/shop.