AR Carbine Flat Wire Spring
The SI Carbine Flat Wire Spring is an economical and easy upgrade to any AR system with a carbine buffer system. The flatwire spring is designed to increase service life of the platform, smooth out the shooting cycle, and greatly outlast the stock spring. Increased bolt load, in addition to decreased compression force, increases reliability in cycling. Additionally, all SI Flat Wire springs are cryogenically stress-relieved to provide greater consistency, longer spring life, and greater resilience to high cyclic rates.