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36 of 62 Items
  • Sale
    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...

    Was: $38.99
    Now: $29.99
  • 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
  • Sale
    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...

    Was: $29.99
    Now: $23.99
  • Sale
    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...

    Was: $63.99
    Now: $46.99
  • KAK 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)...

    $9.99
  • 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
  • Rise Armament RA-140 Super Sporting Drop-In Trigger Rise Armament RA-140 Super Sporting Drop-In Trigger

    Rise Armament RA-140 Super Sporting Drop-In Trigger

    The Affordable, Must-Have Trigger Most factory AR triggers are alright. They get the job done. Sort of. If you’re reading this, then your trigger probably feels gritty, sticky, and inconsistent and for a rifle that should punch out to over 400...

    $129.99
  • 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
  • Rise Armament RA-LE145 Tactical Drop-In Trigger Rise Armament RA-LE145 Tactical Drop-In Trigger

    Rise Armament RA-LE145 Tactical Drop-In Trigger

    The Operator’s Go-To Trigger If you’re the operator, LEO, or hunter that needs one of the most upgraded and dependable triggers available, the LE145 Tactical Trigger from Rise Armament should be your top choice. This drop-in, single-stage...

    $129.99
  • JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 2 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 3 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 4

    JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber

    If you're looking for a simple, yet effective upgrade to your AR to get you out of mil-spec territory with your trigger, then hold up right here. You need to see this. This is the Saber. It's JMT's Single Stage Drop-In 3.5-4 lb Trigger, and it'll...

    $99.95
  • 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...

    $46.74
  • Aero Precision AR15 Enhanced Lower Parts Kit

    Aero Precision AR15 Enhanced Lower Parts Kit

    Aero Precision's Enhanced LPK includes some simple but effective upgrades, like a Magpul MOE pistol grip, and custom billet trigger guard. This kit includes precisely CNC-machined components with tight tolerances to ensure reliable operation once...

    $67.99
  • 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
  • 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
  • Aero Precision M5 .308 Standard Lower Parts Kit

    Aero Precision M5 .308 Standard Lower Parts Kit

    If you're starting an LR-308 build, you'll need a good lower parts kit. Aero Precision makes a lower parts kit designed for their M5, which is Aero Precision's version of a .308 AR. This high-quality M5 LPK is also compatible with our LR-308 80% lowers...

    $67.99
  • 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 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
  • 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
  • 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
  • Aero Precision M5 .308 Enhanced Lower Parts Kit

    Aero Precision M5 .308 Enhanced Lower Parts Kit

    If you're starting an LR-308 build, you'll need a lower parts kit. How about an LPK with an upgraded grip?. Aero Precision's M5 Enhanced .308 Lower Parts Kit provides just that: Quality, mil-spec internals for your stripped lower receiver, or finished ...

    $84.99
  • Ergo Grip, Tactical Deluxe SureGrip for AR-15/M-16

    Ergo Grip Tactical Deluxe SureGrip for AR-15/M-16

    If you're like the rest of us, you find the mil-spec A2 grip that came standard on your AR severely lacking in the area of comfort. Its hard plastic never really gets comfortable, and its angle and texture don't stop your from getting fatigue, especially...

    $34.99
  • 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
  • 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
36 of 62 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.