High-quality 13-coil magazine spring designed for enhanced reliability and consistent performance. Compatible with KMR, BUL, Arma Zeka, and Laugo models, making it an excellent choice for demanding users and competitive shooters. The extended 13-coil design provides increased tension, ensuring stronger and more consistent pressure on the rounds. This results in smoother feeding and reduced risk of malfunctions, especially in high-capacity or heavily used magazines. Suitable for 170 mm magazines. Manufactured from durable, high-elasticity material, the spring offers long service life and resistance to wear, even under intensive use.