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Questions & Answers
What is the difference between the CS-10A and 10B? HELP! I bought the 10A because I thought that its the correct one for the 308 DPMS platform

CS-10A is for carbine length buffer tube, CS-10B is for rifle length buffer tube.

by UncleDano, Verified Owner, April 7, 2022
What is the length of the rifle spring, and how many coils does it have? Manufacturer Answer

The 308 rifle buffer spring is 12.75-13.25" long and has approximately 38 coils.

by Luth-AR, Manufacturer, June 8, 2022
Customer Reviews
Helpful Positive Review
quality spring by freedombirdies, Verified Owner, March 30, 2021
Not all springs are equal, even though it seems like a simple enough product. Coil count and tensioning tend to vary. The Luth-AR 308 spring has been good for me in AR10s or as an AR pistol buffer spring. I order one every now and then just to cha...
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4/5 found this helpful
Most Recent Reviews
as described by saint, Verified Owner, February 3, 2026
still getting short stroking, not the fault of this spring
Read All 2 Reviews
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Product Info for Luth-AR 308 Buffer Spring

The .308 buffer spring is an important link in the overall function of your AR system. A properly weighted and installed buffer spring can make a difference of several hundred rounds in some cases, completely overwhelming your stock spring. Over a thousand rounds can create a buffer spring fatigue situation. While an over-recoil spring may seem like a good idea initially, the longer the buffer tube the more likely it is to break or wear. While a 'light' buffer spring may initially seem like a good idea, a 'heavier' spring may be the better choice in some instances. The 'lighter' spring allows the shooter to use less ammunition. The buffer spring does, however, need to be replaced after only a few shots in order for the shooter to become fatigued and require less shooting. It is, however, still a good idea to keep a buffer along with your standard spring until you find that the spring is adequate for your needs.image

Specifications for Luth-AR 308 Buffer Spring:

Manufacturer: Luth-AR
Color: Silver
Fabric/Material: Tempered spring steel
Gun Make: AR Platform
Gun Model: AR-10
Condition: New
Projectile Caliber: .308 Caliber
Country of Origin: USA
Caliber: .308 Winchester

Package Contents:

  • Luth-AR 308 Buffer Spring

Luth-AR 308 Buffer Spring Orderable Models

List of Orderable Models

  • Luth-AR 308 Buffer Spring, Rifle, Silver, 308-BS-10B , MPN: 308-BS-10B , UPC: 859819007263 , Code: 3FN-BUS-35LUTH-308-BS-10B
  • Luth-AR 308 Buffer Spring, Carbine, Silver, 308-CS-10A , MPN: 308-CS-10A , UPC: 859819007270 , Code: 3FN-BUS-35LUTH-308-CS-10A

Luth-AR 308 Buffer Spring Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Luth-AR 308 Buffer Spring, Rifle, Silver, 308-BS-10B , MPN: 308-BS-10B-EDEMO , Code: 3FN-BUS-35LUTH-308-BS-10B-EDEMO-SC-C
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Last updated 2026-07-25 UTC.