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26 of 26 Items
  • 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...

    $9.99
  • 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...

    $19.99
  • 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...

    $1.49
  • 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...

    $14.99
  • AR10/AR15 Carbine Length Gas Tube

    AR10/AR15 Carbine Length Gas Tube

    Every gas-operated AR with a carbine-length system needs a gas tube of matching length. This is that gas tube. It's compatible with AR-15 and LR-308 / AR-10 sized rifles. See below for more info. Features: Stainless Steel Gas Tube for AR15 & AR10...

    $12.99
  • 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...

    $7.99
  • 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...

    $44.99
  • 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...

    $69.99
  • AR-9 Bolt Carrier Group (Nitride) - 9mm

    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...

    $119.99
  • 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...

    $39.99
  • 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...

    $49.99
  • 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...

    $89.99
  • Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake

    Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake

    If you're someone who does a lot of high-performance shooting, then you want to cut down on the recoil as much as possible while still maintaining a level barrel and thus your accuracy. The people at Phase 5 Weapon Systems know this full well. That's why...

    $144.99
  • Spike's Tactical R2 5.56 Muzzle Brake Spike's Tactical R2 5.56 Muzzle Brake Spike's Tactical R2 5.56 Muzzle Brake

    Spike's Tactical R2 5.56 Muzzle Brake

    Spike's Tactical gets it when it comes to reducing felt recoil for your AR-15. Sure the AR might not kick a lot to begin with, but for you that have AR pistols and generally shorter-barreled builds, the R2 from Spike's Tactical will work wonders. The R2...

    $74.99
  • 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...

    $89.99
  • CMMG 5.56 Muzzle Brake CMMG 5.56 Muzzle Brake CMMG 5.56 Muzzle Brake

    CMMG 5.56 Muzzle Brake

    If you're trying to get more control from your .223/5.56 rifle's barrel, it might be a good idea to swap out the A2 flash hider that probably came with your rifle with a compensator. A great option for you is the CMMG 5.56 Muzzle Brake. This particular...

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

    Aero Precision Delta 556 Muzzle Brake

    On the spectrum from low recoil to less muzzle rise to less concussive blast and flash, you've decided your AR's recoil was manageable how it is. You've decided now to take the edge off the explosion you hear each time you send a round downrange. The...

    $54.99
  • Sale
    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...

    Was: $54.99
    Now: $44.99
  • 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...

    $5.99
  • 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...

    $79.99
26 of 26 Items

 Pre-built uppers, custom barrels, upgraded handguards, muzzle devices and more.

Grab everything you need to build or upgrade your first or next AR-15 upper! We've worked closely with top makers like M-LOK, Aero Precision, GLOCK, and others to provide high-speed upgrades and OEM parts required to finishing or tricking out your custom AR rifle or pistol.

Precision-Built Uppers

All upper assemblies are assembled, torqued and function-tested to ensure your AR's ready to send rounds downrange once you tap down those pivot pins. Each upper assembly includes a mil-spec, M16-profile bolt carrier group and charging handle. All you need is your finished lower assembly! 

What Parts go in an AR-type upper?

If you're building your assembly from scratch, your AR-type upper (and generally all upper assemblies, regardless of caliber) require the following upper parts. Our prebuilt upper assemblies include all components listed below:

Stripped Upper Receiver: The stripped upper houses the bolt carrier group and charging handle. It's also machined with threads and a small hole to attach the barrel and gas tube. 

Barrel: The barrel attaches to the receiver using a barrel nut. Most often, you'll use the barrel nut suppled with your handguard to attach both the guard and the barrel to the receiver. Most barrels are threaded for attaching a muzzle device, like a brake, compensator, or flash hider.

Handguard: Handguards are most often free-float, one-piece units machined from billet aluminum. They include attachment systems like Picatinny rails or M-LOK slots for installing accessories like a foregrip or flashflight.

Gas system: The gas system includes a gas block, pins to secure the block to the barrel, and a gas tube that feeds back into the upper receiver and bolt carrier.

Bolt carrier group with handle: The BCG includes the bolt, firing pin, and mechanisms for chambering, extracting, and feeding rounds from the lower receiver into the upper receiver and barrel. Our uppers typically include a BCG and charging handle, but it will be clearly noted where they are not included. Rest assured we source high-quality BCGs built to mil-spec standards.

Muzzle Device: Although not required, it pays to install a muzzle device on your barrel - especially since most are threaded. A muzzle device can help improve accuracy, reduce felt recoil, and redirect spent gas from the muzzle away from the shooter, reducing muzzle blast.

Easy Drop-in Upgrades

Even if you just bought or built your AR-15, there's plenty of opportunity to upgrade. Make reloads quicker and easy -- especially if you're running a glass optic -- by investing in an oversized charging handle. Want tighter shot groups with less recoil? It takes a few minutes to swap out and torque down a new compensator, like the popular Midwest Industries Muzzle Brake. Piecing together an upgraded mil-spec rifle? Check out our M4-profile barrels, forged from 4150 CMV.


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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.