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  • AR15 Low-Profile Gas Block - .750" AR15 Low-Profile Gas Block - .750" 2 AR15 Low-Profile Gas Block - .750" 3

    AR15 Low-Profile Gas Block - .750"

    Every gas-operated AR (those that don't employ a piston system) needs a gas block of some type to cycle between shots. If you're building an old-school or retro style AR, it may have a fixed front sight that doubles as the gas block or some fold-up...

    $14.99
  • AR-10 / LR-308 .308 Tactical Charging Handle AR-10 / LR-308 .308 Tactical Charging Handle AR-10 / LR-308 .308 Tactical Charging Handle

    AR-10 / LR-308 .308 Tactical Charging Handle

    Fact: you need a charging handle to put your AR-10 (Colt's proprietary design) or LR-308 (the other 90% of all .308 sized AR rifles out there) into battery. Here's one. This is a standard .308 sized charging handle that accommodates both the AR-10 and...

    $15.99
  • 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
  • Magpul RVG® - Rail Vertical Grip

    Magpul® RVG® - Rail Vertical Grip

    The Magpul RVG is a traditional vertical grip made out of durable polymer that is lightweight and has a low profile. With the aggressive TSP texture this allows for more control and is designed for the 1913 Picatinny rail hand guards.  Additional...

    $23.70
  • Magpul MagLink® Coupler – PMAG® 30/40 AR/M4

    Magpul® MagLink® Coupler - PMAG® 30/40 AR/M4

    The Magpul MagLink Coupler has a strong polymer design that is lightweight which allows the shooter to be quick and efficient with reloading. This two-piece non flex MagLink Coupler architecture, attaches two magazines together allowing the shooter to...

    $17.05
  • 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
  • Magpul QD Sling Swivel

    Magpul® QD Sling Swivel

    The Magpul QD Sling Swivel is a detachable manganese-phosphate coated steel design, that is compatible with any push-button 1-1/4 inch webbing for QD sling attachment points, including the two-point MS1 Sling.  Additional Features: Platform: AR15,...

    $13.99
  • 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
  • Aero Precision AR15 A2 Birdcage Flash Hider

    Aero Precision AR15 A2 Birdcage Flash Hider

    If you're building your own AR-15, and you don't intend to use any type of special device on the end of your barrel, then the Aero Precision AR15 A2 Birdcage Flash Hider is a good place to start. While it won't outright beat out any specialized muzzle...

    $6.79
  • 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
  • Strike Industries 5.56/.223 King Comp Compensator Strike Industries 5.56/.223 King Comp Compensator Strike Industries 5.56/.223 King Comp Compensator

    Strike Industries King Comp .223/5.56 Compensator

    Staying on target is key when taking follow-up shots. The best way to achieve this is to train yourself to keep your barrel level between trigger squeezes. To give yourself a little help in that department, you can swap out your mil-spec A2 flash hider...

    $44.95
  • 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
  • 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
  • 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
  • Magpul MOE® Polymer Rail, 5 Slots

    Magpul® MOE® Polymer Rail, 5 Slots

    Everybody knows M-Lok handguards are amazing when it comes to versatility in mounting your favorite accessories to your AR. But the handguard only gives you the real estate; it doesn't give you the means. Here are the means. This is a five-slot section...

    $5.65
  • 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
  • Magpul MS4® Dual QD Sling GEN2 Magpul MS4® Dual QD Sling GEN2 2 Magpul MS4® Dual QD Sling GEN2 3 Magpul MS4® Dual QD Sling GEN2 4 Magpul MS4® Dual QD Sling GEN2 5

    Magpul® MS4® Dual QD Sling GEN2

    The Magpul MS4 Dual QD Sling GEN2 includes two heavy duty push-button QD swivels with the ability to easily switch between a one-point or two-point sling due to the custom steel connection ring. The low profiled MS1 slider offers secure sling adjustments...

    $61.70
  • 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
  • Magpul M-LOK® QD Sling Mount Magpul M-LOK® QD Sling Mount 2 Magpul M-LOK® QD Sling Mount 3 Magpul M-LOK® QD Sling Mount 4 Magpul M-LOK® QD Sling Mount 5

    Magpul® M-LOK® QD Sling Mount

    The Magpul M-LOK QD Sling Mount is made from durable Mil-Spec anodized aluminum that is lightweight. This anti-swivel design offers beveled edges, preventing snagging and rotation. The M-Lok QD Sling Mount provides a forward attachment point compatible...

    $18.99
  • Magpul 5-Slot M-LOK® Aluminum Rail

    Magpul® 5-Slot M-LOK® Aluminum Rail

    You painstakingly picked out your favorite M-Lok handguard for your new AR build, but there's a catch: maybe the vertical grip, light mount or laser mount you have in mind to use on your handguard is made to attach to a 1913 / pic rail like that of an M4...

    $18.95
  • 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
  • Magpul M-LOK® Rail Covers, Type 2

    Magpul® M-LOK® Rail Covers, Type 2

    You've finished your AR and mounted all your accessories to your M-Lok handguard. Sure, it's okay to grip, but it'd be a lot better with some gripping texture instead of all those M-Lok slots. That's why Magpul gives you their Type 2 M-Lok Rail Covers...

    $12.30
  • Magpul AFG-2® - Angled Fore Grip

    Magpul® AFG-2® - Angled Fore Grip

    The Magpul Angled Fore Grip (AFG-2) overall has a shorter length, width, and slimmer design than its predecessor, Magpul's original AFG. There is less recoil and more control using this fore grip since the shooter's hand is naturally placed in the center...

    $33.20
  • 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 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
  • 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
  • Spike's Tactical - AR-308 Lower Parts Kit

    Spike's Tactical - AR-308 Lower Parts Kit

    The Spike's Tactical AR-308 Lower Parts Kit sports military-grade hardware (minus that third safety position) with a great fit and finish. This kit is compatible with both retail-bought .308 stripped lowers, and .308 80% lower receivers. What's...

    $64.80
  • 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
  • Magpul M-LOK® Hand Stop Kit

    Magpul® M-LOK® Hand Stop Kit

    The Magpul M-LOK Hand Stop Kit has a low profile, lightweight design for enhanced weapon control. The M-LOK index point has a forward stop that prevents the shooter's hand from shifting towards the muzzle or front sight assembly.  Additional...

    $23.70

Quality AR parts kits, triggers, receivers, handguards, BCGs, and AR-15 accessories.

Welcome to the parts counter. Ready to build a truly custom AR-15 from scratch? It's all here: Upper parts, lower parts, rail attachments, grips, handguards -- you name it, we've got it.

Need help picking parts? Start with our Builder's Master Guide

AR Lower Parts: What's in a Receiver?

We've sourced quality, mil-spec lower receiver internals and components so you can complete your AR-15 build with confidence backed by guaranteed compatibility. The AR lower parts assembly includes the following:

  • Stripped lower receiver, or fabricated 80% Lower
  • Lower parts kit
  • Buffer tube
  • Buffer and recoil spring
  • Pistol grip
  • Castle nut
  • Latch plate

Grips, castle nuts, and latch plates are typically included in the lower parts kit. An upgraded latch plate (like this Magpul ASAP QD plate) includes a QD sling stud mount for easy carrying. An upgraded drop-in or "cassette" trigger (like this JMT Single Stage) provides a better trigger pull with less weight and faster, smoother resets for improved accuracy.

Ready to assemble? Here's how to install your lower parts kit.

Not sure what parts you need? Check out our full lower assemblies!

AR Upper Parts: Everything You Need

Your finished AR upper is the "business end" of your rifle or pistol: It's responsible for chambering and firing live rounds. So, you're going to want the highest-quality parts for reliability and accuracy. That means investing in a 4150 CMV barrel, an M16-type bolt carrier group, and a forged M4-type upper receiver. We've got all those components available at great prices.

Want to make it even easier? We've got tons of barreled upper assemblies, pre-built with a bolt included, ready for install. Options are available for .308, 6.5 Creedmoor, .223 Wylde, 300 Blackout, and 9mm, and of course, 5.56 NATO.

Here's how to install the AR-15's barrel, gas system, and handguard.

Grab Your Gunsmithing Tools, Too!

Ever try to install an LPK without punches? You probably wound up losing some of those tiny roll pins, halting your build. Get rid of the frustration and guesswork and grab the tools you need to confidently attack your 80% project. We've got quality Armorer's Wrenches, torque wrenches, roll pin kits, vise blocks, and all the other gunsmithing tools you need to go from a hunk or aluminum or polymer to a locked n' loaded shooter. Grab a complete Armorers Kit like the Wheeler set, and you'll have virtually all the tools required.

 


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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.

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