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36 of 53 Items
  • Sale
    AR-15 A2 "Birdcage" .223/5.56mm Flash Hider by Aim Sports AR-15 A2 "Birdcage" .223/5.56mm Flash Hider by Aim Sports

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

    Your AR-15 needs a reliable muzzle device right out of the gate to finish off your build. The AR-15 A2 "Birdcage" .223/5.56mm Flash Hider is the jack of all trades when it comes to AR muzzle devices. Due to its 5-port design, it'll conceal the flash,...

    Was: $10.79
    Now: $8.99
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    AR15 A2 Birdcage Flash Hider by Aero Precision

    AR15 A2 Birdcage Flash Hider by Aero Precision

    If you plan to build your own AR-15, and you don't intend to use any specialized type of muzzle device, then the Aero Precision AR15 A2 Birdcage Flash Hider is a good direction in which to head. While it won't outright beat out any specialized muzzle...

    Was: $8.15
    Now: $6.79
  • Sale
    RVG® - Rail Vertical Grip by Magpul

    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. The aggressive TSP texture allows for more control in any rugged environment. The RVG is designed to be used with the 1913 Picatinny rail...

    Was: $28.44
    Now: $23.70
  • Sale
    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 use a piston system) uses a gas block of some type to cycle between shots. If you're building one of those old-school or retro style AR, yours may have a fixed front sight that doubles as the gas block or some...

    Was: $17.99
    Now: $14.99
  • Sale
    AR10/AR15 Carbine Length Gas Tube

    AR10/AR15 Carbine Length Gas Tube

    If you want your AR-15, LR-308, or AR-10 to cycle ammo reliably, it needs a quality gas tube. This gas tube is compatible with all AR-type rifles and pistols configured with a carbine-length gas system. Use this instructional guide for installing your...

    Was: $14.39
    Now: $11.99
  • Sale
    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" Slanted-End M-Lok Free-Floating Handguard

    Need some "front end with an attitude" to finish off that AR build of yours? How 'bout 12 inches on top and slightly less underneath? Put the finishing touches on your standard-sized AR-15 with this handguard. You get enough rail space on top to mount...

    Was: $107.99
    Now: $89.99
  • Sale
    13-5-m-lok-free-floating-handguard-1 13-5-m-lok-free-floating-handguard-2 13-5-m-lok-free-floating-handguard-3 13-5-m-lok-free-floating-handguard-4 13-5-m-lok-free-floating-handguard-5

    13.5" M-Lok Free-Floating Handguard

    Need some "front end" to finish off that AR build of yours? How 'bout 13.5 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...

    Was: $83.99
    Now: $69.99
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    M-LOK® MVG® Vertical Grip by Magpul

    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 aggressive TSP texture and lightweight design allows for optimal control in any harsh climate.  Additional...

    Was: $26.17
    Now: $21.81
  • Sale
    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...

    Was: $83.99
    Now: $69.99
  • Sale
    Gamma 556 Muzzle Brake by Aero Precision Gamma 556 Muzzle Brake by Aero Precision

    Gamma 556 Muzzle Brake by Aero Precision

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

    Was: $81.59
    Now: $67.99
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    M-LOK® Rail Covers, Type 2 by Magpul

    Magpul M-LOK® Rail Covers, Type 2

    You finally finished your AR and mounted all your add-ons to your M-Lok handguard. It may be fine to grip, but it'd be a lot better with more gripping texture instead of all those remaining M-Lok slots. That's why Magpul gives you their Type 2 M-Lok Rail...

    Was: $14.76
    Now: $12.30
  • Sale
    RED 5.56 Muzzle Brake by Fortis Manufacturing Inc. RED 5.56 Muzzle Brake by Fortis Manufacturing Inc.

    RED 5.56 Muzzle Brake by Fortis Manufacturing Inc.

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

    Was: $85.44
    Now: $71.20
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    M-LOK® Hand Stop Kit by Magpul

    M-LOK® Hand Stop Kit by Magpul

    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 restricts the shooter's hand from sliding towards the muzzle or front sight assembly, protecting from possible...

    Was: $28.44
    Now: $23.70
  • Luth AR Charging Handle - .308

    Luth AR Charging Handle - .308

    The standard .308 from Luth-AR. Made from the lightweight yet durable 6061-T6 aluminum and anodized black, not just for looks, but for protection against corrosion. Perfect for you .308 rifle! Features 6061-T6 Aluminum Anodized Black Compatible with ...

    $30.99
  • CMMG Charging Handle Assembly - AR15

    CMMG Charging Handle Assembly - AR15

    Get yourself a charging handle that won't twist or break so easily under force. The CMMG Charging Handle Assembly is a standard AR-15 handle that is made from a durable 7075-T6 aluminum to ensure longevity with latch installed. Features Made from...

    $33.99
  • Sale
    Sig Sauer Tread 400 Ambidextrous Charging Handle

    Sig Sauer Tread 400 Ambidextrous Charging Handle

    Whether your left or right handed, or both, this is the perfect charging handle for builders and shooters like you. The Sig Sauer Tread 400 Ambidextrous Charging Handle was designed with medium sized latches and dual pins and its longevity is guaranteed...

    Was: $83.99
    Now: $69.99
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    AR-9 Bolt Carrier Group (Nitride) - 9mm

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

    After carefully choosing the parts for you new AR9 upper build, you just need that last piece that is going to bring to life. Made in the USA, this AR9 Bolt Carrier Group is machined from 8620 Steel that ensures a high durability and longevity and...

    Was: $137.99
    Now: $114.99
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    Tactical Charging Handle for AR-10 / LR-308 .308 Tactical Charging Handle for AR-10 / LR-308 .308 Tactical Charging Handle for AR-10 / LR-308 .308

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

    It's simple: you need a charging handle to put your .308 sized AR rifle into battery, whether it's an AR-10 (Colt's proprietary design) or LR-308 (the other 90% of all .308 sized AR rifles out there). Here's one. This is a standard .308 sized charging...

    Was: $19.19
    Now: $15.99
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    Muzzle Brake for AR Rifles by Midwest Industries

    Muzzle Brake for AR Rifles by Midwest Industries

    If managing recoil for your AR is your main concern, you'll want a muzzle brake that mitigates it as much as possible. The Midwest Industries Muzzle Brake does. Throw compensation and hiding your flash to the wind, and get as much recoil reduction as...

    Was: $35.94
    Now: $29.95
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    5.56 Muzzle Brake by CMMG 5.56 Muzzle Brake by CMMG 5.56 Muzzle Brake by CMMG

    CMMG Muzzle Brake - 5.56

    If you're trying to get better control from your .223/5.56 rifle's barrel, it may 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...

    Was: $65.99
    Now: $54.99
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    Delta 556 Muzzle Brake by Aero Precision Delta 556 Muzzle Brake by Aero Precision Delta 556 Muzzle Brake by Aero Precision

    Delta 556 Muzzle Brake by Aero Precision

    On the spectrum from low recoil to less muzzle rise to less concussive blast and flash, you've decided your AR's recoil doesn't need to be lessened. Consequently, you've decided to take the edge off the explosion you hear each time you send a round...

    Was: $61.19
    Now: $50.99
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    AFG-2® - Angled Fore Grip by Magpul

    AFG-2® - Angled Fore Grip by Magpul

    The Magpul Angled Fore Grip (AFG-2) has a slim design due to the fact that this fore grip has a shorter length and width compared to Magpul's previous model, the AFG. There is more control and less recoil using this fore grip since the shooter's hand is...

    Was: $39.84
    Now: $33.20
  • Sale
    XTM® Enhanced Rail Panel by Magpul

    Magpul XTM® Enhanced Rail Panel

    You mounted all your add-ons the pic rails of your handguard and got her set up exactly how you want her. Everything feels good, except the still-exposed sections of rail on your handguard. If and when they dig into your hand, they're a distration...

    Was: $9.06
    Now: $7.55
  • Sale
    Magpul Angled Foregrip - Black - M-lok

    Magpul Angled Foregrip - Black - M-lok

    MagPul continues their reign of tradition, excellent quality, and innovation with this M-Lok Angled Foregrip. This triangle grip is perfect for large or small hands, with its new and improved sleek design. Aiding in muzzle control, this AR-15 foregrip is...

    Was: $30.72
    Now: $25.60
  • 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 Fully Stripped Upper Receiver

    This stripped upper receiver is made from 6061 T6 aluminum and conforms to all mil-spec measurements. Being the A3 type, it also features a "flat top." This means instead of the old-school carry handle that the A2 style used to have, you get a...

    Was: $69.59
    Now: $57.99
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    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 on going the standard (and the easiest) route with the muzzle end of your .223 or 5.56mm chambered AR by installing a muzzle device, you'll need a crush washer. This is the one you need. You just slide it onto the threading of your barrel,...

    Was: $1.91
    Now: $1.59
36 of 53 Items

Your #1 source for all quality, mil-spec AR upper parts.

Piecing together a custom, precision-capable AR upper is one of the fun parts of becoming an AR-15 owner. We've got all the components you need to make that happen: From M4-type barrels to F/A bolt carriers, from lightweight handguards to oversized charge handles, you'll find everything you need to assemble any 5.56, .223, or other caliber upper assembly to pair with your new or existing lower.

Pre-Built Uppers, Stripped Receivers, Barrels, Handguards & More!

Whatever you need to start or finish your AR's upper assembly, we've got it all: Lightweight, free-float handguards. M4-profile 4150 barrels. Gas tubes and low-profile gas blocks. M16-profile, .308, and 9mm bolt carrier groups. Charging handles. You name it, you need it, grab it here. All parts we sell for AR uppers are made in the USA and are forged, machined, and coated to mil-spec standards or better.

Improve Accuracy With a Free-Float Handguard

Two-piece handguards are cheap and effective, but they can hinder accuracy -- especially if you're rocking one of those old-school "FSB" front sight posts. It's time to upgrade to a proper, low-profile gas block and a quality, one-piece, free-float handguard. You'll shed some serious weight and free up your barrel from carrying the load, resulting in better accuracy.

Plus, you'll get to enjoy the M-LOK rail system, which also reduces weight and provides better ergonomics than the typical Picatinny quad rail. Each of our free-float guards are custom-made, sporting a hardcoat anodized finish and weighing one pound or less! Barrel nuts are included for an easy installation.

Build Your Custom AR Upper From Scratch

Want to make a true, one-off upper assembly that's designed and built to your exact specifications? Do it yourself, it's easier (and more affordable) than you think: We've got quality mil-spec, M4-type stripped upper receivers available, plus quality 4150 CMV barrels. Grab a BCG and charging handle, pair it up with one of those nice new handguards, and you're ready.

 

Follow our guide to install your AR-15 barrel, gas system, and handguard!

Finish Your Build With a Compensator, Brake, or Flash Hider

Virtually every AR barrel comes with standard 1/2x28 pitch or 5/8x24 pitch threads, so it only makes sense to finish (or upgrade) your AR's upper with a quality muzzle device that reduces felt recoil and improves control. Whether you're gunning for the traditional "bird cage" flash hider or you want to throw some flames and tighten up your groups with a proper brake or comp, we've got you covered.

Your custom AR upper awaits.


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 GunBuilders.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.