The SI Carbine Flat Wire Spring is an affordable and simple upgrade for any AR system with a carbine buffer. The Flatwire spring extends the service life of the platform, smooths the shooting cycle, and significantly outlasts the stock spring. Increased bolt load, along with decreased compression force, enhances cycling reliability. Additionally, all SI Flat Wire springs are cryogenically stress-relieved to ensure greater consistency, longer spring life, and better resilience to high cyclic rates. At a cost similar to stock carbine springs, the SI Flatwire is a convenient choice for those replacing worn buffer springs or building new rifles.
| Item # | RSR|SI-AR-HSFG-FDE |
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| Available Colors | Flat Dark Earth |
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Most in-stock items ship within 1–2 business days via UPS or USPS. Free standard shipping on orders over $149 to the contiguous United States.
All firearms must be transferred through a licensed FFL dealer. We cannot ship firearms directly to you — the firearm will be shipped to your local FFL dealer who will complete the transfer.
Questions about FFL transfers? Contact our team — we're here to help make the process smooth and compliant.
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