The Retro Arms SR25 SiCr M110 spring is a high-quality main spring designed for Long type gearboxes, including SR25 platforms. Made from chromium-silicon alloy steel (SiCr), it offers excellent durability, elasticity, and consistent performance.
The progressive irregular coil design allows smoother compression without sacrificing power, ensuring efficient energy transfer and stable FPS output.
An ideal upgrade choice for players seeking reliable and durable internal tuning components.
