Blackout Defense "ENDURANCE" AR-15 Chrome Silicon Buffer Spring - Carbine Length


8000 in stock


Our buffer springs are made out of certified chrome silicon wire stock–the same wire used in NASCAR and Formula One engines–and are designed to withstand extreme heat and abuse.


  • Certified ASTM Grade A877 Valve-Quality Chrome Silicon Wire Stock
  • Designed for Longevity under Extreme Heat and Abuse
  • Consistent Spring Pressure through Rifle Cycling
  • Length:  11.25″
  • Coils:  39
  • Weight:  1.79 oz.
  • All Material, Components, and Packaging Made in the USA
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