From the link I provided above.... Enhanced Spring, Recoil Buffer, Action, Carbine


NOTE: This item is for ADJUSTABLE length M4 style buttstocks.

Rifle-length recoil springs for full-sized fixed buttstocks are available HERE.

For AR-15 / M4 Carbine:

• Constructed from certified USA made chrome silicon spring wire

• Heat treated, stress relieved

• Provides consistent spring pressure for hundreds of thousands of cycles (estimated 750,000+)

• Greater resistance to heat & high stress cyclic rates

• Improves operation, long-lasting performance

• Consistent pressure reduces bolt bounce

• Significantly reduces the perceived "twang" noise which is common during firing