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Compared to the original override spring, the upgraded spring provides a 115%-120% increase in spring force, resulting in a more efficient recoil force feedback and overall improved performance. The operating feel is also more realistic. The spring is made of high-quality piano wire that undergoes low-temperature annealing to prevent brittleness and excessive hardness. The surface is treated with bead strike to reduce manufacturing stress, ensuring durability. It can function normally with 8KG (134A) gas at a temperature of 25°C.