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    Mil-spec 6-Position AR-15 Buffer Tube Mil-spec 6-Position AR-15 Buffer Tube 2 Mil-spec 6-Position AR-15 Buffer Tube 3

    Mil-spec 6-Position AR-15 Buffer Tube

    If you're building your own AR rifle, your stock, brace, or whatever you plan on having on its rear end has to mount on somehow. You'll need a buffer tube. This is a standard mil-spec buffer tube and is compatible with all the common calibers and...

    Was: $17.99
    Now: $13.99
  • Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly

    Adjustable Carbine Stock & Buffer Tube Assembly

    Whether you bought stripped lower, or just finished an 80% lower, you'll need two components to assemble it and make it functional: A lower parts kit, and a buffer tube assembly like this one. Buffer tube assemblies work with your lower parts kit,...

    $39.99
  • mil-spec-ar-15-buffer-tube-assembly-1

    Mil-spec AR-15 Buffer Tube Assembly

    This stock-less Buffer Tube Assembly is perfect if you're completing an AR pistol, or if you bought a custom or upgraded stock for your rifle build. This kit includes all other buffer components needed to work with your lower parts kit and upper assembly...

    $29.99
  • Aero Precision AR15 Enhanced Carbine Buffer Kit Aero Precision AR15 Enhanced Carbine Buffer Kit Aero Precision AR15 Enhanced Carbine Buffer Kit

    Aero Precision AR15 Enhanced Carbine Buffer Kit

    You need a buffer tube assembly on your AR-15. And usually it's nothing "special." You screw parts onto other parts, and it serves its purpose as part of your AR. You spend your hard-earned money on these parts, so it'd be nice if they'd do more for you...

    $70.99
  • LR-308/AR-10 Buffer Tube Assembly

    LR-308/AR-10 Buffer Tube Assembly

    Get yourself a buffer tube assembly that will withstand just about anything. Forged form 7075-T6 aluminum, the buffer tube is not only lightweight, but is extremely durable as well. It's also compatible with most aftermarket adjustable stocks to allow...

    $29.99
  • Sylvan Arms AR-15 QD Backplate Sylvan Arms AR-15 QD Backplate

    Sylvan Arms AR-15 QD Backplate

    So you've seen the benefits of using a QD sling for your AR-15, and now you want to upgrade. You're on the right track, but where do you attach it, and what if you're left handed? If you prefer to keep your AR tight and close to your body, you'll want to...

    $19.99
  • AR9 Buffer Tube Assembly

    AR9 Buffer Tube Assembly

    If you're in need of a new AR9 buffer tube assembly kit, then we've got you covered. The buffer tube is crafted from 7075-T6 aluminum which makes it very light and durable as hell. It's even compatible with most adjustable 6-position stocks so that you...

    $44.99
  • Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube

    Aero Precision AR15/AR10 Enhanced Carbine Buffer Tube

    You may consider the buffer tube to be nothing fancy, and "just one of the pieces" you need to make your AR-15 build work. And while it's true you need one, it can be true at the same time that having the right one can enhance your building and shooting...

    $44.99
  • AR-15 9mm Carbine Buffer

    AR-15 9mm Carbine Buffer

    If you're building an AR chambered in 9mm, then standard parts won't do. You need those created to work with the 9mm AR's blowback design. This is the 9mm buffer you need. It's made specifically for 9mm AR rifles and pistols. See below for more info...

    $19.99
  • Sylvan Arms ARH300 Folding Stock Adapter Sylvan Arms ARH300 Folding Stock Adapter Sylvan Arms ARH300 Folding Stock Adapter Sylvan Arms ARH300 Folding Stock Adapter Sylvan Arms ARH300 Folding Stock Adapter

    Sylvan Arms Folding Stock Adapter (ARH300)

    Trick out your AR-15 by making it more easily stowable to carry with you to the range. Sick of carrying around huge bulky rifle bags and cases? Wish your rifle was short enough and small enough to fit into something smaller? Shorten it for travel with...

    $149.99
  • AR-15 Pistol Buffer Tube Assembly

    AR-15 Pistol Buffer Tube Assembly

    If you're going the pistol route with your AR build, you'll need a pistol buffer tube assembly on your AR's rear end to stay legal, unless you're jumping through hoops with the government. And by jumping through hoops, of course I mean filling out the...

    $69.99
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Mil-spec buffer tubes, springs, buffers, and castle nuts for every AR rifle and pistol.

Most lower parts kits do not come with a buffer tube. That's because slight variances in receiver buffer tube housing dimensions mean that the threads on one tube may not work with a particular receiver. That's determined by whether your receiver is "commercial" or "mil-spec." We sell exclusively mil-spec buffer tubes since most receivers fit this measurement.

Not sure which tube you need? Read our guide comparing mil-spec and commercial tubes.

What's in a Buffer Tube Kit?

Our buffer tube kits include all the other stuff your lower parts kit doesn't come with, so you can complete the assembly of your fabricated 80% lower or retail-bought stripped AR lower receiver. Each buffer tube kit includes the following components:

  • Threaded buffer tube with stock/brace position latch holes
  • AR-15 (3.0-oz) or LR-308/AR-10 "Shorty" (5.4-oz) buffer
  • Mil-spec threaded castle nut and notched latch plate
  • Mil-spec, universal AR recoil spring

Not sure which buffer you need? Read the guide to AR buffers and weights.

LPK-and-Buffer-Tube Combo Kits Available

Want everything required to assemble your lower? Take out the guess work and grab an AR-15 or LR-308 lower build kit. Each kit comes with a full buffer tube kit for your 5.56/.223 or .308 build, as well as a mil-spec stock and full lower parts kit with hammer, trigger, safety, disconnector, and all springs, pins, and detents required for the LPK install. We even have a kit that includes all of the above, plus an AR-15 80% lower! All you'll need is an upper assembly, a little time to fabricate your lower, and you're ready to hit the range.

Tools Required for Assembly

If you've got your lower parts kit and buffer tube ready for assembly, you'll need a few specialty hand tools to get the job done:

Use our guide on how to install the lower parts kit! It includes instructions for installing your buffer assembly, too.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At 80-Lower.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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.