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Adjustable Carbine Stock & Buffer Tube Assembly for LR-308/AR-10

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No LR-308 80% lower receiver build is complete without a buffer kit. In combination with a lower parts kit (sold separately), this kit includes all components necessary to finish assembling your .308 lower receiver.

What's Included

  • Buffer Tube
  • .308 Buffer
  • Recoil Spring
  • Castle Nut
  • Latch Plate
  • Adjustable Stock

Mil-Spec / Standard Buffer Fitment

This buffer assembly includes a mil-spec tube with an outer diameter of 1.148" and a thread pattern of 1-13/16" x 16. It's designed to fit any typical LR-308 stripped lower receiver or .308 80% lower that's also advertised with mil-spec fittings. Virtually all modern AR-15 receivers are manufactured with mil-spec fittings.

Commercial vs. Mil-spec Buffer Tubes

The tube is also machined with the typical six-position detents, ensuring it's compatible with most M4/M16-type and other adjustable aftermarket buttstocks and pistol braces.

Check out custom stocks and AR braces here.

Includes "Shorty" .308 Buffer

This buffer tube assembly includes a 3.8-ounce "Shorty" .308 recoil buffer. It's designed to fit inside the standard AR-15 buffer tube, which is physically shorter than the AR-10's original, longer buffer tube. This ensures compatibility with standard AR-type buttstocks and latch plates.

Buffer Installation Instructions

Installing the buffer assembly is relatively simple. You will need an Armorer's Wrench to get the job done. If you're also installing your lower parts kit, we recommend buying a set of roll pin punches.

Guide: How to Install The AR Buffer and LPK

Need an Upper Assembly?

If you're completing a custom .308 AR build with this buffer tube assembly, be sure to check out our barreled uppers. MOA-capable rifle configurations are available with stainless and carbon barrels, and each includes a .308 bolt carrier and charging handle.

Buy a Barreled Upper Assembly Here.



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Shipping Restrictions

Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily. only ships within the United States. Federal legislation dictates we cannot ship our products internationally.


We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.