Sprinco Usa Ar-15/M4 Enhanced Hammer Spring
Sprinco Usa Ar-15/M4 Enhanced Hammer Spring, Replacement AR-15 M4 Enhanced Hammer Spring. The Hammer Spring is made of 17-7 PH Stainless Steel that has been heat treated and stress relieved, passivated, and precision tolerances. The springs are cryogenic processed and moly plated. Mfg: Sprinco Usa