Modify S170+ Spring

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XTB Modify S170+ It is finely manufactured from A class piano wire. Very durable and strong. Irregular pitch coiling for enhanced performance. Very Consistent FPS. Easy to install. Every spring has gone through vigorous and Sophisticated quality tests from the moment a new design leaves the software drawing through to final mass production. The XTB Modify S170+ coil spring with irregular-pitch is designed for enhanced performance. Precision manufactured of the high-grade piano wire with high durability and strength, the XTB Modify S170+ is easy to install. Show more