The GEISSELE AUTOMATICS Super 42 Braided Buffer Spring and H3 Buffer Combo uses a unique three-strand braided buffer spring similar to the legendary German MG42 machine gun. This arrangement allows for better energy absorption and harmonic dampening by allowing the springs to flex separately against each other, increasing the reliability and improving the function of your AR-15. Includes an H3 heavy carbine buffer. Super 42 Spring and H3 Buffer Are Designed to Work Together As a Set Designed to Improve Function/Reliability 3 Independent Strands of Wire Provides Harmonic Dampening/Energy Absorber