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36 of 66 Items
  • Sale
    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
  • Sale
    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit

    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit

    Why waste time choosing each part for your AR9's lower? This lower build kit includes all the parts you need to assemble your fabricated AR9 80% lower or retail-bought 9mm stripped lower. Note: Due to ATF rule 2021R-08F, any pistol with a stabilizing...

    Was: $299.99
    Now: $189.99
  • Sale
    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...

    Was: $69.99
    Now: $59.99
  • Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Want an AR-15 trigger that suffers no creep, take-up, or over-travel? Looking for the easiest-to-install LPK? How about the most affordable parts kit possible? This mil-spec AR-15 LPK comes in at a great price with machining and performance that feels...

    $39.99
  • 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
  • AR15 LPK Missing Parts Kit

    AR15 LPK Missing Parts Kit

    This AR15 LPK Missing Parts Kit has all the essentials for any lost parts, replacement parts, or for your next custom build. All parts are proudly made in the USA. This LPK Missing Parts Kit comes with: (1) buffer retainer (1) buffer retainer spring (1)...

    $11.99
  • KAK-308-LPK

    LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    We strive to provide accurate photographs of our product. Due to parts availability, this kit's trigger and hammer may come in stainless or black. Want an LR-308 trigger that suffers no creep, take-up, or over-travel? Looking for the easiest-to-install...

    $49.99
  • Premium AR-15 Lower Parts Kit Premium AR-15 Lower Parts Kit 2 Premium AR-15 Lower Parts Kit 3 Premium AR-15 Lower Parts Kit 4

    Premium AR-15 Lower Parts Kit

    A lower parts kit is essential to finishing your AR-type 80% lower or FFL-bought stripped lower receiver. This upgraded LPK maintains mil-spec fitment, but it also comes with a MagPul pistol grip and Magpul MOE trigger guard. This Lower Parts Kit...

    $64.99
  • mil-spec-ar-15-butt-stock-1

    Mil-spec AR-15 Butt Stock

    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...

    $13.99
  • SBA3 MOE Pistol Lower Build Kit

    SBA3 MOE Pistol Lower Build

    Looking for the perfect way to upgrade your AR pistol? Complete your AR-15 pistol build the right way with the SBA3 MOE Pistol Lower Build Kit! Features a quality pistol brace by SB Tactical and an upgraded lower parts kit. This SBA3 MOE Pistol Lower...

    $219.99
  • AR15 LPK - Basic Build Kit

    AR15 LPK - Basic Build Kit

    The Kak Industry AR15 Lower Parts Kit comes with all of the basic essentials you'll need for your own custom AR15 build. This build kit includes the following: bolt catch kit magazine catch kit hammer & trigger pins pivot pin & detent &...

    $26.99
  • Magpul® MOE® AR-15 Build Kit Magpul® MOE® AR-15 Build Kit 2 Magpul® MOE® AR-15 Build Kit 3 Magpul® MOE® AR-15 Build Kit 9 Magpul® MOE® AR-15 Build Kit 6

    Magpul® MOE® AR-15 Lower Build Kit

    Once you've grabbed a stripped lower or 80% lower (sold separately) you'll need a parts kit like this one. It provides the internals for your receiver, making it functional. In addition to its mil-spec parts, this kit includes upgraded Magpul®...

    $134.99
  • Magpul®  MOE® Enhanced AR15/M4 Polymer Trigger Guard Magpul®  MOE® Enhanced AR15/M4 Polymer Trigger Guard Magpul®  MOE® Enhanced AR15/M4 Polymer Trigger Guard

    Magpul® MOE® Enhanced AR15/M4 Polymer Trigger Guard

    The Magpul® MOE® Enhanced Trigger Guard is a simple but effective customization that can improve your AR's lower. It provides more room in the trigger well for gloved fingers, and installation is simple: This guard doesn't require any punches or...

    $8.99
  • 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
  • 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
  • Magpul  MOE® Mil-Spec Carbine Stock Magpul  MOE® Mil-Spec Carbine Stock Magpul  MOE® Mil-Spec Carbine Stock Magpul  MOE® Mil-Spec Carbine Stock

    Magpul® MOE® Mil-Spec Carbine Stock

    The Magpul MOE® Mil-Spec Carbine Stock is light, tough, and comfortable. Its shielded latch provides smooth action while preventing accidental adjustments to length of pull. Loosely based on the original M4 buttstock, this skeletonized version...

    $37.99
  • Magpul MOE® AR15/M4 Grip

    Magpul® MOE® AR15/M4 Grip

    Let's face it. The AR-15 for how amazingly modular it is and how it can adapt to any situation, falls short in one key area: the grip is bad. It doesn't care if you're comfortable holding it or not. Not to mention the angle is horrible. The way an AR's...

    $18.99
  • 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
  • UTG® AR15 Ergonomic Pistol Grip

    UTG® AR15 Ergonomic Pistol Grip

    The UTG® AR15 Ergonomic Pistol Grip includes a non-slip texture, palm swell, and thumb rest for maximum comfort and stability. The grip angle offers easy accessibility to the trigger along with increasing shooting performance and accuracy...

    $10.99
  • r-j-single-stage-drop-in-trigger-1 r-j-single-stage-drop-in-trigger-2 r-j-single-stage-drop-in-trigger-3 r-j-single-stage-drop-in-trigger-4 r-j-single-stage-drop-in-trigger-5

    Single Stage Drop-In Trigger

    Look, everybody knows you need a trigger to make your AR do its job. And while all those mil-spec triggers out there that come in who knows how many lower parts kits do their job adequately, that's just it. They're just "adequate." Time to step it up and...

    $159.99
  • AR15 Pin & Detent Parts Kit

    AR15 Pin & Detent Parts Kit

    The KAK Industry AR15 Pin & Detent Parts Kit is made out of the best parts on the market. This kit is great for replacement parts, a new build, or having spare parts. This kit includes: a pivot pin takedown pin pivot and takedown detents hammer and...

    $19.99
  • Magpul CTR® Carbine Stock – Mil-Spec Magpul CTR® Carbine Stock – Mil-Spec 2 Magpul CTR® Carbine Stock – Mil-Spec 3

    Magpul® CTR® Carbine Stock - Mil-Spec

    The Magpul CTR Carbine Stock has a light, anti-snag, A-framed design that protects the latch from accidentally releasing. Designed as a lightweight upgrade to the AR-15's original six-position adjustable stock, The Magpul CTR Stock provides the same...

    $56.95
  • Magpul MOE+® Grip – AR15/M4

    Magpul® MOE+® Grip - AR15/M4

    The Magpul MOE+ Grip has a reinforced rubber mold wrapping around the polymer body, allowing for maximum comfort and weapon control. The durable material prevents snags and damage, permitting peak performance in rugged environments. The MOE+ Grip...

    $22.75
  • ALG Defense ACT Advanced Combat Trigger

    ALG Defense ACT Advanced Combat Trigger

    Got an admiration for AR builds resembling those from a previous era? We do too. But if you're like us, you're just not a fan of the mil-spec trigger. It's gritty and has a rough pull, and it generally feels like crap. But there's a way to keep that...

    $69.00
  • Leapers, Inc. - UTG, UTG PRO, Ambidextrous Grip Leapers, Inc. - UTG, UTG PRO, Ambidextrous Grip Leapers, Inc. - UTG, UTG PRO, Ambidextrous Grip Leapers, Inc. - UTG, UTG PRO, Ambidextrous Grip

    UTG PRO Ambidextrous Grip by Leapers, Inc.

    Get more out of your AR-15's grip, and get it to do more for you. This is the UTG PRO Ambidextrous Grip by Leapers Inc. Aside from polymer construction, it's been molded with excellent ergonomics to reduce fatigue, and so you can really get an...

    $14.97
36 of 66 Items

 All the parts you need to get your AR's lower ready for an upper.

The piece-by-piece nature of building the AR-15 can get a little overwhelming, especially if it's your first time. That's why we've compiled all the AR-15 parts that you need to complete the "lower half" of your rifle or pistol. With a fully built lower assembly, you can attach a barreled upper receiver, slap in a magazine, and start hitting targets at the local range.

Parts Required to Finish Your AR's Lower

In addition to a fabricated 80% lower receiver or AR-15 stripped receiver bought from an FFL, you'll need the following components which can all be found right here:

  • Buffer tube
  • Buffer
  • Recoil spring
  • Butt stock or brace
  • Lower parts kit (includes hammer, trigger, safety, springs and pins)

New builder? Use our Master guide to pick the right lower parts.

Drop-in Trigger Upgrades

One of the easiest ways to upgrade your AR before you even finish your build is by simply swapping out your factory trigger setup for a drop-in unit, like the ones available from ACT and Rise Armament. These self-contained triggers include the trigger, disconnector, and hammer preinstalled. All you need to do is drop the unit into the receiver, and tap in your pins!

Need help with assembly? Here's how to install the AR-15 lower parts kit.

 


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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.