The SpinCo AR-15 rifle buffer springs are 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, which will experience significantly fewer cycles over its lifetime. To ensure lasting strength and efficiency, each spring undergoes meticulous heat treatment, shot peening and is enhanced with Sprinco's proprietary formula. This process guarantees that the spring maintains optimal performance throughout the life of your rifle. The SpinCo Green rifle buffer spring is an excellent upgrade for enhancing the long-term reliability and functionality of your AR-15, providing peace of mind and superior performance in every use. For rifle length buffer tubes Color-coded as green Standard power Constructed from chrome silicon wire material Heat-treated and shot peened