AIRTECH STUDIOS Spring Shims (AEG Power Increase) 10mm Inner Barrel

The washers are designed to slide over the spring guide to create spring tension. The more washers, the more tension and more power. 4 washers of various sizes are included to adjust the desired power you need: Washer 1 - Increase of 5 FPS Washer 2 - Increase of 10 FPS Washer 3 - Increase of 15 FPS Washer 4 - Increase of 20 FPS The Washer They are designed to be able to combine various sizes and adapt the output FPS. Internal diameter 10mm. Compatibility: Tokyo Marui standard