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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...

    $23.70
  • 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
  • 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
  • AR-9 Bolt Carrier Group (Nitride) - 9mm AR-9 Bolt Carrier Group (Nitride) - 9mm 2 AR-9 Bolt Carrier Group (Nitride) - 9mm 3 AR-9 Bolt Carrier Group (Nitride) - 9mm 4

    AR-9 Bolt Carrier Group (Nitride) - 9mm

    You've meticulously picked out the parts needed for your new AR9 upper, and now you need  that final piece that is going to breathe some life into. Made in the USA, this AR9 Bolt Carrier Group is machined from 8620 Steel that ensures a high...

    $109.99
  • 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
  • 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,...

    $69.95
  • 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
  • Magpul MS1® Sling - Black Magpul MS1® Sling - Black 2 Magpul MS1® Sling - Black 5 Magpul MS1® Sling - Black 6

    Magpul® MS1® Sling - Black

    The Magpul MS1 two-point sling offers smooth rapid transitions when lengthening or shortening the sling to allow hands free shooting support or rifle carry. With the MS1 there are no loops, tails, or any hazards that may cause snagging. In testing, the...

    $37.95
  • Magpul XTM® Enhanced Rail Panel

    Magpul® XTM® Enhanced Rail Panel

    You mounted all your accessories on your handguard's pic rails exactly where you want them. Everything feels good, except the still-exposed sections of rail on your handguard. They're no fun at all when they dig into your hand. Magpul brings you the...

    $7.55
  • 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...

    $242.20
  • Magpul RSA® QD - Rail Sling Attachment QD Magpul RSA® QD - Rail Sling Attachment QD 2 Magpul RSA® QD - Rail Sling Attachment QD 3 Magpul RSA® QD - Rail Sling Attachment QD 4 Magpul RSA® QD - Rail Sling Attachment QD 5

    Magpul® RSA® QD - Rail Sling Attachment QD

    The Magpul RSA QD is a low profile, two point sling positioned at an angle for maximum comfort and easy accessibility to the push-button. The RSA QD provides a forward attachment point compatible with other QD swivel system slings and the Magpul MS4...

    $27.99
  • Elite Tactical AR-15 Magazine, Black (30 Rounds) Elite Tactical AR-15 Magazine, Black (30 Rounds) 2

    Elite Tactical AR-15 Magazine, Black (30 Rounds)

    Quality, affordable, poly 30-rounders. Simple. The Elite Tactical AR-15 magazine is a great alternative to more expensive polymer and aluminum magazines. Made from an incredibly impact-resistant, injection-molded polymer, the Elite Tactical mags can take...

    $10.99
  • Aero Precision Gamma 556 Muzzle Brake Aero Precision Gamma 556 Muzzle Brake

    Aero Precision Gamma 556 Muzzle Brake

    If being quick with follow-up shots from your AR-15 counts, you'll want either a muzzle brake to control recoil or a compensator to reduce muzzle rise. The good people at Aero Precision want you to have both, in one single device. This is the Gamma 556...

    $67.99
  • 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
  • Midwest Industries Muzzle Brake for AR Rifles

    Midwest Industries Muzzle Brake for AR Rifles

    If managing recoil for your AR is your primary concern, you'll want a muzzle brake that does the utmost to mitigate it. The Midwest Industries Muzzle Brake does just that. Throw compensation and hiding your flash to the wind, and get the most recoil...

    $29.95
  • Midwest Industries 2-Chamber Muzzle Brake Midwest Industries 2-Chamber Muzzle Brake

    Midwest Industries 2-Chamber Muzzle Brake

    The AR-15's A2 "birdcage" flash hider really is a great design. It dissipates expelled gas, usually in five directions, pointed in several upward and side-facing paths. It keeps your visual path to the target clear, so you can quickly re-level your aim...

    $39.95
  • 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...

    $17.96
  • 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...

    $34.15
  • AR9 Replacement Mag Catch AR9 Replacement Mag Catch 2 AR9 Replacement Mag Catch 3 AR9 Replacement Mag Catch 4

    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
  • Aero Precision Gamma 7.62 Muzzle Brake Aero Precision Gamma 7.62 Muzzle Brake Aero Precision Gamma 7.62 Muzzle Brake

    Aero Precision Gamma 7.62 Muzzle Brake

    If being quick with follow-up shots from your LR-308 counts, you'll want either a muzzle brake to control recoil or a compensator to reduce muzzle rise. The good people at Aero Precision want you to have both, in one single device. This is the Gamma 7.62...

    $76.49
  • Rise Armament .223/5.56 RA-701 Compensator Rise Armament .223/5.56 RA-701 Compensator

    Rise Armament .223/5.56 RA-701 Compensator

    Want to completely eliminate muzzle rize? Reduce felt recoil by 67%? Add a badass-lookin' muzzle device on your AR-15 in the process? You can check all three boxes and keep some cash in your wallet with Rise Armament's affordable RA-701 Compensator. This...

    $89.00
  • Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake Fortis Manufacturing, Inc. RED 5.56 Muzzle Brake

    Fortis Manufacturing Inc. RED 5.56 Muzzle Brake

    If you frequently put many rounds downrange with your .223/5.56 AR in rapid succession, you need to squeeze as much control out of your rifle as possible. One way to do this is to replace your mil-spec A2 flash hider with a muzzle brake. For exactly this...

    $74.99
  • HEXMAG AR-15 Magazine, Carbon Fiber (30 Rounds)

    HEXMAG AR-15 Magazine, Dark Grey (30 Rounds)

    HEXMAGs: Organize your ammo. HEXMAG's unique "HEXID" system provides color-coded tabs on the floorplate of each magazine, allowing you to load, store, and organize your ammo without mixing it all up. Want to keep your 5.56 and .223 separate? Or stop...

    $15.99
  • Elite Tactical Systems Group, Magazine, 223 Remington/556NATO, 30 Rounds, Fits AR Rifles, Carbon Smoke Elite Tactical Systems Group, Magazine, 223 Remington/556NATO, 30 Rounds, Fits AR Rifles, Carbon Smoke 2

    Elite Tactical AR-15 Magazine, Carbon Smoke (30 Rounds)

    Form and function, and better than mil-spec. When it comes to 5.56 and .223 magazines, the NATO standard gets the job done. But it could be a lot better, and that's where Elite Tactical Systems' new carbon smoke see-through magazines come in. Made from a...

    $13.99
  • AR 15 Dust Cover (Aluminum) 2 AR 15 Dust Cover (Aluminum) 1

    AR 15 Dust Cover (Aluminum)

    Quality, US-made AR-15 dust cover assembly. This mil-spec AR 15 dust cover includes a rod and spring for installation. The cover is finished with a standard black anodized coating, ensuring it matches all standard, stripped AR-15 upper receivers in color...

    $6.99
  • Davidson Defense "Achron" AR-15 13" M-Lok Handguard Davidson Defense "Achron" AR-15 13" M-Lok Handguard Davidson Defense "Achron" AR-15 13" M-Lok Handguard Davidson Defense "Achron" AR-15 13" M-Lok Handguard

    Davidson Defense "Achron" AR-15 13" M-Lok Handguard

    A lightweight, quality, affordable AR 15 handguard. Who says custom quality has to cost you? This affordable, free-float, M-LOK AR 15 handguard provides all the features and functionality you want in a custom, billet aluminum unit -- without any sticker...

    $59.99

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.

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.