Armaspec Spring Black ARM181-AR15 The Armaspec Braided Buffer Spring BBS provides improved performance" reliability and functionality to your standard mil-spec buffer spring. You will experience a smoother" quieter and more reliable weapon system. The braid is designed with 51 active coils to give tighter tolerances while being compressed and the three strand design allows for the energy from the bolt carrier to be absorbed and dispersed evenly during cycle time. Utilizing this technology gives you more than double the life of a standard mil-spec buffer spring.