Luth-AR 308 Carbine Buffer Spring

The Luth-AR 308 Carbine Buffer Spring (brand part number 308-CS-10A) is a replacement recoil spring sized for AR-10 carbine buffer tubes chambered in .308 Winchester/7.62 NATO. This spring works with a .308 carbine recoil buffer to drive the bolt carrier group back into battery after each shot, and heavier .308 recoil impulses put more wear on a buffer spring than a 5.56 build does. Swapping in a fresh, correctly rated spring is a simple, affordable way to restore reliable cycling on an AR-10 that has seen heavy round counts. It is a straightforward replacement part for builders assembling a new AR-10 lower or troubleshooting an existing carbine buffer system.

Key Specifications

• Sized for AR-10 carbine buffer tubes.
• Classified as a carbine buffer spring, matched to a .308-weight recoil buffer.
• Works with .308 Winchester/7.62 NATO carbine builds.
• Sold as an individual replacement part, not bundled into a full buffer kit.

Frequently Asked Questions

When should I replace a buffer spring? A worn or weakened spring is a common cause of cycling issues, especially on a .308 build where recoil impulses are heavier than 5.56.

Does this fit a rifle-length buffer tube? No, this spring is sized for a carbine-length AR-10 buffer tube.

What caliber is this spring built for? .308 Winchester/7.62 NATO AR-10 carbine builds.

Buy the Luth-AR 308 Carbine Buffer Spring

Order the Luth-AR 308 carbine buffer spring from our Lubbock, Texas gun shop for fast, insured shipping. See more Luth-AR AR buffer system parts for your AR-10.