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AR Lower Parts

  • AR-9 Ejector AR-9 Ejector 2

    AR9 Replacement Ejector w/ Screws

    This is a replacement ejector for our AR9 80% lower receiver. Features: Fits ZR9 & New Frontier Armory Pattern AR-9 PCC Made from 17-4 Stainless Steel hardened to RC42 Includes 2 cap screws

    $11.99
  • 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
  • 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
  • AR9 Replacement Mag Catch AR9 Replacement Mag Catch AR9 Replacement Mag Catch AR9 Replacement Mag Catch

    AR9 Replacement Mag Catch

    This is the replacement magazine catch for our AR9 80% lower receiver. Features: Billet aluminum catch Dowel pin and capture set screw included

    $29.99
  • 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
  • Magpul® MOE+® AR15/M4 Grip Magpul® MOE+® AR15/M4 Grip Magpul® MOE+® AR15/M4 Grip

    Magpul® MOE+® AR15/M4 Grip

    Magpul® has built quite a name for themselves over the years with their aftermarket AR platform furniture and add-ons. Take their MOE® grip for your AR. It feels great, the grip angle is miles ahead of the standard A2 grip your AR probably came...

    $22.75
  • 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
  • Ergo Grip Sure Grip for AR-15/M16 Ergo Grip Sure Grip for AR-15/M16

    Ergo Grip Sure Grip for AR-15/M-16

    If you're someone who frequently uses your AR for long durations, then comfort is paramount. You need to reduce fatigue in your grip hand however possible. With that in mind, Ergo Grip gives your their Sure Grip for AR-15/M-16. First, it's shaped and...

    $21.55
  • PSA MOE SBA3 Lower Assembly Kit 1 PSA MOE SBA3 Lower Assembly Kit 2 PSA MOE SBA3 Lower Assembly Kit 3 PSA MOE SBA3 Lower Assembly Kit 4 PSA MOE SBA3 Lower Assembly Kit 5

    PSA MOE SBA3 Lower Build Kit

    Whether you're getting your stripped lower receiver ready to build an AR-15 pistol or just want to change things up and convert your SBR into a pistol, we've got just the kit for you. With the all-inclusive SBA3 lower assembly, you'll receive parts from...

    $179.99
  • Magpul MOE-K2® Grip – AR15/M4 Magpul MOE-K2® Grip – AR15/M4-2

    Magpul® MOE-K2® Grip - AR15/M4

    The Magpul MOE-K2 Grip offers a full size design that has a steeper vertical grip angle compared to the previous model, the MOE-K. With a steeper vertical grip angle allowing the shooter's hand to be positioned closer to the body, aggressive TSP texture,...

    $19.90
  • Magpul MOE-K2+® Grip – AR15/M4 Magpul MOE-K2+® Grip – AR15/M4-2

    Magpul® MOE-K2+® Grip - AR15/M4

    The Magpul MOE-K2+ Grip has a durable rubber mold wrapping around the hard polymer body, preventing snags and damage, which allows this grip to outlast in rugged environments. The MOE-K2+ offers a steeper vertical grip angle allowing the shooter's hand...

    $23.70
  • ALG Defense QMS Quality Mil-Spec Trigger

    ALG Defense QMS Quality Mil-Spec Trigger

    Some of us like our AR platform rifles traditional or built as close to mil-spec as possible. We build replicas of that Colt model 629 or of the old-school M-16, because we want that nostalgia when we shoot. There's just one problem: the mil-spec...

    $49.00
  • 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
  • MOE+® EPT SBA3 Lower Build KIt

    MOE+® EPT SBA3 Lower Build KIt

    If you want to build AR-15 pistol, you'll want the MOE+® EPT SBA3 Lower Build Kit. It's got everything you need to finish the lower receiver. This kit includes a Magpul® MOE+® grip and MOE® trigger guard, plus a lower parts kit with a...

    $199.99
  • Strike Industries Enhanced Lower Parts Kit

    Strike Industries Enhanced Lower Parts Kit

    The Strike Industries Enhanced Lower Parts Kit is an excellent mil-spec+ LPK. It includes an ambidextruous safety selector and quality, machined components that provide smooth, reliable operation. Additional Features: Enhanced Bolt Catch Strike Magazine...

    $72.95
  • 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
  • Spike's Tactical Lower Parts Kit for .223/5.56

    Spike's Tactical Lower Parts Kit for .223/5.56

    The Spike's Tactical Lower Parts Kit provides reliable operation inside any AR-15's 80% lower or stripped lower receiver without breaking your budget. Its mil-spec fitment and springs ensure you get a clean, repeatable trigger and hammer reset for good...

    $71.96

 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.