Spring, 280%, AEG, PDIHigh quality spring 280% from Japanese PDI. Made from high-quality spring wire (chrome-silicon steel) with a blackened surface against corrosion. Material and the entire production process has been certified by the Japanese certification office, which means high quality and grade. Through proper adjustment can spring a long retains its characteristics (tested with >20 thousand fire and without change).
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Japanese manufacturers mark their spring by percentage. This can be a quite confusing for someone, so approximate toughness of spring is M140 of standard marking.