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AR Lower Parts

30 of 71 Items
  • Sale
    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...

    Was: $129.99
    Now: $99.97
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    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...

    Was: $159.99
    Now: $99.97
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    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...

    Was: $69.00
    Now: $67.97
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    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...

    Was: $14.97
    Now: $12.97
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    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...

    Was: $24.95
    Now: $22.95
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    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...

    Was: $59.99
    Now: $49.97
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    Spike's Tactical - AR-15 Lower Parts Kit Without Trigger

    Spike's Tactical - AR-15 Lower Parts Kit Without Trigger

    Spike's Tactical's AR-15 Lower Parts Kits are made out of high-quality parts with precision machinework and expert quality control to ensure reliable functionality as soon as they're installed. This LPK does not include a fire control group, and is...

    Was: $114.99
    Now: $109.97
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    Spike's Tactical Enhanced Lower Parts Kit for .223/5.56

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

    Spike's Tactical's Enhanced Lower Parts Kit for .223/5.56 AR rifles includes upgraded internals, coated with nickel boron for smoother operation and less fouling. The hammer and trigger pins have been replaced by anti-roll pins to make sure your fire...

    Was: $152.96
    Now: $144.97
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    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...

    Was: $23.70
    Now: $17.97
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    Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    It's time to get serious about your AR's trigger. Two words: Bravo Company. And this is their PNT Trigger Assembly. Sure it's been given a nickel finish, but that's not all. The interacting surfaces of its individual parts have also been coated in PNT,...

    Was: $69.95
    Now: $59.97
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    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...

    Was: $68.25
    Now: $59.97
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    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,...

    Was: $19.90
    Now: $14.97
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    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...

    Was: $72.95
    Now: $59.97
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    Magpul PRS® GEN3 Precision-Adjustable Stock

    Magpul® PRS® GEN3 Precision-Adjustable Stock

    The Magpul PRS GEN3 Precision-Adjustable Stock is the ultimate shoulder rest for enhanced AR accuracy. With a built-in cheek riser, adjustable rubber pad for recoil mitigation, precision adjustment knobs, and mil-spec tube fitment, the PRS GEN3 allows...

    Was: $239.99
    Now: $199.97
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    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...

    Was: $71.96
    Now: $67.97
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    Magpul MIAD Mission Adaptable Grip Magpul MIAD Mission Adaptable Grip

    Magpul® MIAD Mission Adaptable Grip

    Got a preference for how you think an AR grip should feel? Yeah, anything but the original mil-spec grip, right? We hear ya. Fortunately, Magpul heard ya too. That's why they have the MIAD, the Mission Adaptable grip for your AR. It's just as great as...

    Was: $34.15
    Now: $27.97
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    Spike's Tactical Pro Grip Spike's Tactical Pro Grip-2

    Spike's Tactical Pro Grip

    Replace that mil-spec uncomfortable grip on your AR with the Pro Grip by Spike's Tactical. It has an ergonomically correct feel and has been shaped and contoured to fit your hand's natural grip, to make your hand and your rifle fit together like they're...

    Was: $17.96
    Now: $14.97
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    Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit

    Gun Nuts® Ambidextrous Sporter Lower Parts Kit

    Features a notched hammer and ambidextrous safety. Combine the best of old-school ARs with the ergonomics of a modern parts kit with the Sporter Ambi LPK from Gun Nuts. Features an original notched hammer, for compatibility with unshrounded bolt carriers...

    Was: $105.99
    Now: $79.97
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    Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit

    Gun Nuts® Ambidextrous Pro Line Lower Parts Kit

    Precision machining, ambidextrous safety. The Pro Line Ambidextrous AR-15 LPK provides the best in American engineering, affording precision-cut fire control components that ensure the highest reliability out of the box. Coupled with an ambi safety,...

    Was: $87.99
    Now: $69.97
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    Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit

    Gun Nuts® Sporter Lower Parts Kit

    Features a notched hammer and precision-machined parts. Combine the best of old-school ARs with the ergonomics of a modern parts kit with the Sporter LPK from Gun Nuts. Features an original notched hammer, for compatibility with unshrounded bolt carriers...

    Was: $93.99
    Now: $74.97
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    1911 AR Pistol Grip 1911 AR Pistol Grip 1911 AR Pistol Grip 1911 AR Pistol Grip 1911 AR Pistol Grip

    1911 AR Pistol Grip

    Give Your AR the 1911 Treatment. These are real, bona fide 1911 grips, complete with standard grip panel threaded inserts, made specifically for the AR platform! Anodized and available in Black, Gray, or OD Green, these grips are incredibly strong and...

    Was: $64.99
    Now: $24.97
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    Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group

    Gun Nuts® Sporter Fire Control Group

    Features an O.G. Sporter Hammer, for unshrouded bolt carriers. Got an old Colt or Bushmaster bolt carrier group? Want a modern, reliable reproduction notched hammer? You've found the right kit: The Gun Nuts Sporter Fire Control Group features a replica...

    Was: $40.99
    Now: $29.97
30 of 71 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.