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36 of 112 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
  • 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
  • Sale
    D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 2 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 3 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 4

    D&H AR/M4 5.56/223 30rd Aluminum Magazine

    D&H brings you a classic look with new and improved features. Made from heat treated aircraft aluminum coated in Teflon, these rugged AR15 magazines are built to last and are protected from corrosion and are designed to hold both .223 and 5.56...

    Was: $9.99
    Now: $8.99
  • 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
  • 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
  • ar-15-fully-stripped-upper-receiver-1 ar-15-fully-stripped-upper-receiver-2 ar-15-fully-stripped-upper-receiver-3 ar-15-fully-stripped-upper-receiver-4 ar-15-fully-stripped-upper-receiver-5

    AR-15 Forged Stripped Upper Receiver

    Ready to piece together your own AR? Finished up your 80% lower or stripped lower and want to assemble your own upper receiver piece by piece? Start with quality: Grab one of our forged, mil-spec (7075-T6) "Flattop" stripped AR-15 upper receivers. This...

    $57.99
  • Magpul® Angled Foregrip - M-Lok

    Magpul® Angled Foregrip - M-Lok

    This MagPul M-Lok Angled Foregrip is a great addition to any AR-15 or M16 weapon. This AFG (Angled Foregrip) looks sleek compared to other handle options. Weighing in at just 1.2oz, including hardware, this grip is ideal for any and everyone. MagPul is a...

    $25.60
  • 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
  • UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip UTG Ultra Slim Angled M-LOK Foregrip

    UTG Ultra Slim Angled M-LOK Foregrip, Matte Black

    This Ultra Slim Angled MLOK Foregrip from UTG is constructed from 6061-T6 Aluminum and anodized with a matte black finish. It is compatible with M-LOK style rails, shrouds, and hand guards. This angled foregrip provides a very comfortable, forward grip...

    $19.97
  • 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
  • Magpul® MOE® Carbine Stock & Buffer Tube Assembly Magpul® MOE® Carbine Stock & Buffer Tube Assembly 2 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 3 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 4 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 5

    Magpul® MOE® Carbine Stock & Buffer Tube Assembly

    This partial AR-type lower build kit includes a buffer tube assembly and Magpul® MOE® Carbine Stock. These mil-spec-fit components work with standard AR lower receiver parts, including our available AR-15 80% lowers. What's Included Magpul®...

    $69.99
  • 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
  • AR15 Tapered Steel Crush Washer 1/2"x28 AR15 Tapered Steel Crush Washer 1/2"x28  2

    AR15 Tapered Steel Crush Washer 1/2"x28

    If you plan to go the traditional (and the easiest) route with the business end of your .223 or 5.56mm chambered AR by installing a muzzle device, you'll need a crush washer. This is that crush washer. You simply slide it onto the threading of your...

    $1.59
  • 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
  • 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
  • AR-15 A2 "Birdcage" .223/5.56mm Flash Hider AR-15 A2 "Birdcage" .223/5.56mm Flash Hider

    AR-15 A2 "Birdcage" .223/5.56mm Flash Hider

    Your AR-15 needs a solid muzzle device right out of the gate to get your build up and running. The AR-15 A2 "Birdcage" .223/5.56mm Flash Hider is the jack of all trades when it comes to muzzle devices. Due to its 5-port design, it adequately conceals the...

    $8.99
  • UTG® Quick Install Dust Cover -  .223/5.56,  Black UTG® Quick Install Dust Cover -  .223/5.56,  Black 2 UTG® Quick Install Dust Cover -  .223/5.56,  Black 3 UTG® Quick Install Dust Cover -  .223/5.56,  Black 4 UTG® Quick Install Dust Cover -  .223/5.56,  Black 5

    UTG® Quick Install Dust Cover - .223/5.56, Black

    Installing a dust cover onto your AR's upper receiver can be a pain. If you're starting with just parts, you need to install the C-clamp onto the rod without launching it across the room and never seeing it again. Then you thread the rod through the...

    $9.99
  • 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 M-LOK® MVG® Vertical Grip

    Magpul® M-LOK® MVG® Vertical Grip

    The Magpul M-LOK MVG Vertical Grip is a reinforced hard polymer material that attaches directly to M-LOK handguards and forends. The TSP texture and lightweight design allows for optimal control in any environment. Additional Features: Length: 3.0 in...

    $21.81
  • 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
36 of 112 Items

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.