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47 of 47 Items
  • Magpul® AR15 Furniture Kit - MOE®, Carbine-Length Magpul® AR15 Furniture Kit - MOE®, Carbine-Length 2 Magpul® AR15 Furniture Kit - MOE®, Carbine-Length 3 Magpul® AR15 Furniture Kit - MOE®, Carbine-Length 4 Magpul® AR15 Furniture Kit - MOE®, Carbine-Length 5

    Magpul® AR-15 Furniture Kit - MOE®, Carbine-Length

    If you specifically have an M4-style or a CAR-15-style AR-15 with all stock parts including the carbine-length gas system, and you want some upgrades, then this is for you. You can get several comfort and quality-of-life upgrades all in one place with...

    $85.35
  • R2 5.56 Muzzle Brake by Spike's Tactical R2 5.56 Muzzle Brake by Spike's Tactical R2 5.56 Muzzle Brake by Spike's Tactical

    R2 5.56 Muzzle Brake by Spike's Tactical

    Spike's Tactical understands the need to reduce 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 builds with generally shorter barrels, the R2 from Spike's Tactical will perform extremely...

    $74.99
  • 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 manufactured from a durable Mil-Spec anodized aluminum, that is a lightweight anti-swivel design offering beveled edges to prevent snagging and rotation. The M-LOK QD Sling Mount provides a forward attachment point...

    $19.95
  • 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 slim two point sling design, angled at a position for optimal comfort and easy access to the push-button. The RSA QD provides a forward attachment point compatible with push-button QD slings and the Magpul MS4 sling...

    $29.95
  • 5-Slot M-LOK® Aluminum Rail by Magpul

    Magpul 5-Slot M-LOK® Aluminum Rail

    You took all the time to pick out your favorite M-Lok handguard for your new AR build, but the problem is that 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...

    $19.95
  • UTG Ultra Slim Angled M-LOK Foregrip, Matte Black UTG Ultra Slim Angled M-LOK Foregrip, Matte Black-2 UTG Ultra Slim Angled M-LOK Foregrip, Matte Black-3 UTG Ultra Slim Angled M-LOK Foregrip, Matte Black-4 UTG Ultra Slim Angled M-LOK Foregrip, Matte Black-5

    UTG Ultra Slim Angled M-LOK Foregrip, Matte Black

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

    $29.99
  • Gamma 7.62 Muzzle Brake by Aero Precision Gamma 7.62 Muzzle Brake by Aero Precision Gamma 7.62 Muzzle Brake by Aero Precision

    Gamma 7.62 Muzzle Brake by Aero Precision

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

    $79.99
  • .223/5.56 RA-701 Compensator by Rise Armament .223/5.56 RA-701 Compensator by Rise Armament

    .223/5.56 RA-701 Compensator by Rise Armament

    If you have need of controlling recoil, you're going to want to replace that standard mil-spec flash hider on the end of your .223 or 5.56mm AR-15 with a compensator. If you're looking to install one and not have to worry about how well it'll hold up...

    $89.99
  • King Comp .223/5.56 Compensator by Strike Industries King Comp .223/5.56 Compensator by Strike Industries King Comp .223/5.56 Compensator by Strike Industries

    King Comp .223/5.56 Compensator by Strike Industries

    If the goal is to stay on target when taking follow-up shots then, it's crucial 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 with a compensator...

    $44.99
  • 2-Chamber Muzzle Brake by Midwest Industries 2-Chamber Muzzle Brake by Midwest Industries

    2-Chamber Muzzle Brake by Midwest Industries

    The AR-15's A2 "birdcage" flash hider was created with a great design. It expells gas, usually in five directions, pointed in several upward and side-facing paths. It keeps your visual path to the target flash free, so you can quickly get back on target...

    $49.99
47 of 47 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.