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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…
Let’s face it: just having a bare buffer tube or pistol tube on the end of your pistol build makes your pistol look like it skipped leg day at the gym? Slap a proper pistol brace on there and enjoy better accuracy and comfort with the SBA3 Pistol Stabilizing Brace by SB Tactical. This SBA3…
The original M4-type buttstock. Aftermarket stocks are awesome, but some builders prefer the good ole’ mil-spec stuff. This M4 six-position buttstock perfectly replicates the stock found on service-issued rifles. It’s made from the same injection-molded polymer and sports a six-position-adjustable latch for dialing in length of pull. M4 Stock: Mil-Spec Fitment (1.148″ OD) This “M4″…
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…
Finish or upgrade your rifle or pistol with a quality AR stock or pistol brace.
Enjoying good accuracy with your AR means investing in a comfortable AR stock or brace. We’ve got you covered with both configurations. Grab a standard M4-type, six-position buttstock for the classic look right here. We also carry upgraded buttstocks from Magpul, including their bench rifle-accurate PRS Gen 3 and their popular, do-it-all CTR Carbine Stock.
Want to build a portable PDW? We’ve sourced the unique Sylvan Arms Folding Stock Adapter, which allows you to collapse your AR’s buttstock to a folded position alongside the receiver. This uniquely simple adapter requires no gunsmithing, and installs onto your existing receiver.
The SBA3 Pistol Stabilizing Brace is a quality, affordable brace for any AR pistol. With a 5-position adjustable lever and wrist strap, the SBA3 is comfortable and affords better control and accuracy. We also have the brace in our upgraded Magpul MOE pistol lower build kit, which includes everything needed to turn a completed 80% lower or stripped lower receiver into a ready-to-function lower assembly.
Virtually all modern AR platforms and components adhere to the typical mil-spec fitment, especially when it comes to our 80% lowers and just about every buffer tube on the market. That’s why all stocks and braces we sell also provide mil-spec buffer tube fitment. They’re all compatible with our rifle kits and pistol build kits, and all standalone buffer tubes and buffer kits we sell.
“Are pistol braces legal?”
Generally, yes. ATF’s 2023 rule that would have treated most braced pistols as short-barreled rifles (SBRs) was vacated by a federal court, and the Justice Department dropped its appeal in 2025. ATF has said, however, that some braced pistols set up to be fired from the shoulder can still be classified as SBRs, so check current guidance. Always follow federal, state and local laws when configuring your AR. An SBR must still be registered under the NFA; the $200 tax dropped to $0 on January 1, 2026. See AR-15 Pistol vs SBR.
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.
