Enhance the reliability of your extended magazine setups with the Springer Precision 13 Coil Magazine Spring. Designed specifically for 170mm magazines and basepad extensions, this extra-power spring delivers consistent tension to ensure smooth, dependable feeding even under demanding conditions. Key Features 13-coil design optimized for 170mm magazine lengths with basepad extensions Extra-power construction provides increased tension for reliable round feeding High-quality materials for long-lasting performance and resistance to fatigue Precision engineering from Springer Precision, a trusted name in competition accessories