The SpinCo AR-15 carbine buffer spring is engineered for exceptional durability and performance, crafted from premium chrome silicon wire stock renowned for its resilience in high-stress environments, such as Formula One and motor valve springs. These springs endure up to 15,000,000 compression cycles in a single race, making them an ideal choice for your AR-15 carbine, which will experience significantly fewer cycles over its lifetime. To ensure lasting strength and reliability, each SpinCo buffer spring undergoes a meticulous process of heat treatment, shot peening and application of a proprietary formula. This comprehensive treatment enhances spring efficiency, ensuring your rifle maintains peak performance for years to come. Choose the SpinCo carbine buffer spring to elevate the long-term reliability and functionality of your AR-15. For carbine length buffer tubes Color-coded white Constructed from chrome silicon wire material Heat-treated and shot peened