Strike Industries AR Carbine Flat Wire Spring Black One Size. Strike Industries uses cryogenic stress relieving to make these AR15 Buffer Springs improve consistency and smooth out the shooting cycle. The Strike Industries AR Carbine Flat Wire Steel Spring is great for competition shooting where rapid reliable firing is needed because it increases the bolt load and decreases the compression force. Pick up the economical Strike Industries AR Carbine Replacement Spring for your next build or repair. Specifications for Strike Industries AR Carbine Flat Wire Spring: Manufacturer: Strike Industries Color: Steel Fabric/Material: Cryo-cycled 17-7 PH Steel Gun Make: AR Platform Gun Type: Rifle Length: 13.8 in Condition: New Features of Strike Industries AR Carbine Flat Wire Spring Cryocycled 177 ph steel for strength reliability and longevity Decreased harmonics lessens system vibration for faster follow up shots. Increased bolt load for more positive feeding Reduces distracting AR "twang" Package Contents: Strike Industries AR Carbine Flat Wire Spring 1x Carbine Length Flat Wire Spring Strike Industries SI-AR-FWS-C: AR Carbine Flat Wire Spring Black One Size