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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...

    $14.97
  • 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
  • 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 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 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
  • 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
  • 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 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 12-m-lok-free-floating-handguard-1 12-m-lok-free-floating-handguard-2 12-m-lok-free-floating-handguard-3 12-m-lok-free-floating-handguard-4 12-m-lok-free-floating-handguard-5

    12" M-Lok Free-Floating Handguard

    Need some "front end" to finish off that AR build of yours? How 'bout 12 inches of it? Put the finishing touches on your standard-sized AR-15 with this handguard. You get enough rail space on top to mount your backup sights or even optics. The M-Lok...

    $69.99
  • 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
  • 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 556 Muzzle Brake Aero Precision Gamma 556 Muzzle Brake

    Aero Precision VG6 Gamma 556 Muzzle Brake V2

    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...

    $84.99
  • 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
  • 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
  • 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

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.