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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, allowing your lower and upper receivers to work together. What’s Included Buffer…
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. What’s Included Buffer Tube Carbine Buffer Recoil Spring Castle Nut Latch…
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…
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 for more personalization and custumization. This kit includes the following: end plate, castle nut, buffer tube,…
The Magpul ASAP QD is a Melonite coated steel, that offers a wide range of motion, providing an advantage by preventing sling snagging and easy transitions to the weapon or shoulder. The ASAP QD is compatible with one-point type slings that offer push-button detachable sling swivels. Additional Features: Compatibility: Mil-Spec and Commercial Spec Carbine Receiver…
Mil-spec, 4.6 ounces, fits all standard buffer tubes. This H2 buffer provides a reduction in bolt carrier group travel and increases recoil damping, making it ideal for over-gassed AR-15s, suppressed setups, and super safeties and forced reset selectors. H2 Buffer Features & Specs Weight: 4.6 oz. Size: Carbine All-steel construction Fits all mil-spec buffer tubes…
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 can customize the length of your rifle to your need….
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:
Armorer’s Wrench / Castle Nut Wrench
AR-15 Roll Pin Punch and Hammer Set
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.
