Improve your AR15 Carbine's function and reliability with Geissele's Super 42 Rifle Length Braided Wire Spring. The spring utilizes an innovative design composed of three independent strands of wire – the same design used by the German MG42 Machinegun. The braided wire design operates like a harmonic damper as well as an energy absorber by allowing the springs to flex independently from each other. The result displaces energy which decreases the risk of spring failure, while also making the rifle more reliable. In comparison to the standard spring, the Super 42 Braided Wire Spring is less likely to lose length and force over time, and also eliminates the irritating spring reverberations heard and felt through the buttstock. In addition, the Super 42 Braided Wire Spring’s return force is roughly 15% stronger than the standard spring, which enhances the carbine's ability to strip cartridges out of the magazine when the weapon is dirty or when using steel case ammunition. Features of the Super 42 Braided Wire Spring and Buffer Combo: Uses three independent strands of wire – the same design used by the German MG42 MachinegunDecreased risk of spring failure & enhances reliability Less likely to lose length and force over timeEliminates the irritating spring reverberations heard and felt through the buttstock15% stronger return force when compared to the standard spring Greater reliability when weapon is dirty or when using steel case ammunition Geissele Super 42 Rifle Length Spring 04-308-F