Upgrade your magazine performance with the Springer Precision 11 Coil Magazine Spring, engineered for superior reliability in extended magazine setups. This extra-power spring delivers consistent feeding and dependable operation, making it an essential upgrade for competitive shooters and tactical users alike. Key Features Extra-power design provides enhanced tension for reliable cartridge feeding, even with magazine extensions and higher capacities. Precision-coiled construction ensures smooth compression and expansion cycles, reducing the risk of misfeeds or failures to feed. Compatible with a wide range of popular pistol platforms including Springfield XD, XDM, Hellcat, Echelon, SIG Sauer, and more when paired with appropriate base pads and followers. Ideal replacement for worn factory springs, restoring optimal function and extending the service life of your magazines.