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AR Parts

  • AR-308 Lower Parts Kit - Spike's Tactical

    Spike's Tactical - AR-308 Lower Parts Kit

    The Spike's Tactical AR-308 Lower Parts Kit has a great fit and finish along with a military grade design that is built to last. This parts kit is meant to be used with Spike's Tactical's forged sets and may not be compatible with any other large frame...

    $64.80
  • PRS® GEN3 Precision-Adjustable Stock by Magpul

    Magpul® PRS® GEN3 Precision-Adjustable Stock

    The Magpul PRS GEN3 Precision has Melonite coated steel shafts that protects against corrosion and wear, offering the ability to adjust the length of pull and the cheek piece via aluminum detent knobs. This stock includes a non-slip rubber butt-pad that...

    $242.20
  • HEXMAG AR-15 Magazine, Carbon Fiber (30 Rounds)

    HEXMAG AR-15 Magazine, Dark Grey (30 Rounds)

    HEXMAGs: Better ammo organization. Hidden beneath each HEXMAG is a cool lil' feature: The "HEXID" color system, which uses simple color-coded pucks built into the floorplate to help you separate, load, and identity your different rounds and calibers...

    $13.99
  • Lower Parts Kit for .223/5.56 by Spike's Tactical

    Spike's Tactical Lower Parts Kit for .223/5.56

    The mil-spec lower parts kit is adequate. It does the job it was designed for. The trigger, hammer, disconnector, detents, springs, and roll pins are perfectly suited to the job of making your lower (and the rest of your AR) work as intended. As with the...

    $71.96
  • NiB-X Lower Parts Kit, Mod 3 by WMD Guns

    WMD Guns NiB-X Lower Parts Kit, Mod 3

    You know, you can get more out of your AR shooting experience even just by making minor changes to your AR's lower parts kit. This lower parts kit by WMD Guns is mil-spec save for one detail: the trigger, hammer, and disconnector have all been coated in...

    $89.99
  • Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group Gun Nuts® Pro Line Fire Control Group

    Gun Nuts® Pro Line Fire Control Group

    Mil-spec fitment. Improved trigger feel. The Pro Line FCG provides your AR with the perfect, all-in-one trigger upgrade. Featuring standard pin and receiver fitment, this 100% U.S.-made fire control group sports. The precision-machined, perfectly cut...

    $26.99
  • Magpul® PMAG AR/M4 GEN 2 MOE Window 5.56/223 30rd Magazine Magpul® PMAG AR/M4 GEN 2 MOE Window 5.56/223 30rd Magazine 2

    Magpul® PMAG GEN 2 MOE Window 5.56/223 30rd Magazine

    GEN 2 Magpul MOE Magazines: top-tier reliability. Magpul needs no introduction. Their poly 30-round mags have been trusted by law enforcement and military for years. Their GEN 2 iteration provides some key improvements to this already-legendary design,...

    $15.15
  • 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

    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...

    $114.99
  • 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...

    $67.99
  • 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...

    $44.95
  • 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
  • 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...

    $18.95
  • Magpul® AR-15 Furniture Kit - MOE®, Mid-Length Magpul® AR-15 Furniture Kit - MOE®, Mid-Length 2 Magpul® AR-15 Furniture Kit - MOE®, Mid-Length 3 Magpul® AR-15 Furniture Kit - MOE®, Mid-Length 4 Magpul® AR-15 Furniture Kit - MOE®, Mid-Length 5

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

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

    $107.99
  • 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...

    $44.95
  • Magpul MS1® Sling - Black Magpul MS1® Sling - Black 2 Magpul MS1® Sling - Black 3 Magpul MS1® Sling - Black 4 Magpul MS1® Sling - Black 5

    Magpul® MS1® Sling - Black

    The Magpul MS1 two-point sling offers hands free shooting support and rifle carry with smooth rapid transitions when lengthening or shortening the sling. The MS1 eliminates the issue of snagging due to there being no loops, tails, or any other hazards to...

    $37.95
  • 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...

    $39.84
  • Magpul MOE® Mid-Length M-LOK Handguard Magpul MOE® Mid-Length M-LOK Handguard 2 Magpul MOE® Mid-Length M-LOK Handguard 3

    Magpul MOE® Mid-Length M-LOK Handguard

    Looking for a lightweight handguard for your mid-length AR15? Then check out the Magpul MOE M-Lok handguard! Its crafted from a heat-resistant polymer to be incredibly lightweight yet highly rugged. This handguard aslo includes rows of M-Lok slots on the...

    $35.10
  • 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...

    $89.99
  • 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...

    $50.99
  • 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...

    $52.20
  • Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit Gun Nuts® Ambidextrous Sporter Lower Parts Kit

    Gun Nuts® Ambidextrous Sporter Lower Parts Kit

    Features notched hammer and ambidextrous safety. Want to upgrade an old AR-15 with modern performance? The Sporter Lower Parts Kit from Gun Nuts does just that. This LPK features a notched hammer for compatibility with unshrounded bolt carrier groups...

    $105.99
  • Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit Gun Nuts® Ambidextrous Pro Line Lower Parts Kit

    Gun Nuts® Ambidextrous Pro Line Lower Parts Kit

    Precision components with ambidextrous safety. The Pro Line Ambidextrous Lower Parts Kit from Gun Nuts features OEM-spec components, proudly made in America with precision machining to guarantee reliable cycling with a perfect trigger pull and hammer...

    $87.99
  • Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit Gun Nuts® Sporter Lower Parts Kit

    Gun Nuts® Sporter Lower Parts Kit

    Features notched hammer and precision-fit components. Want to upgrade an old AR-15 with modern performance? The Sporter Lower Parts Kit from Gun Nuts does just that. This LPK features a notched hammer for compatibility with unshrounded bolt carrier...

    $93.99
  • Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit Gun Nuts® Pro Line Lower Parts Kit

    Gun Nuts® Pro Line Lower Parts Kit

    Precision-machined components with mil-spec fitment. The Pro Line Lower Parts Kit from Gun Nuts features OEM-spec components, proudly made in America with precision machining to guarantee reliable cycling with a perfect trigger pull and hammer reset...

    $72.99
  • Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group Gun Nuts® Sporter Fire Control Group

    Gun Nuts® Sporter Fire Control Group

    Includes a notched hammer for unshrounded BCGs. The Sporter Fire Control Group from Gun Nuts provides a modern, mil-spec reproduction of the old Colt and Bushmaster "notched" hammers, to ensure reliable cycling with unshrounded bolt carrier groups. All...

    $40.99

Quality, American-made AR-15 parts for customizing your rifle or pistol.

Part of the fun of owning an AR-15 is the ability to easily customize it. Whether it's adding a new foregrip or trigger, replacing your bulky handguard with a lightweight unit, slappin' on a sling, or replacing that basic A2 flash hider with a proper compensator or flash hider, we've got you covered with quality, US-made components.

 

New to building ARs? Check out our complete "how-to" and parts guide!

Mil-Spec and Upgraded LPKs

The most important part of assembling your AR-15 is the installation of the lower parts kit. That's why we've carefully selected a quality catalogue of LPKs that satisfy mil-spec fitment - allowing them to work with all our available 80% lowers - and upgraded lower parts with enhanced grips and custom, high-performance coatings that improve trigger feel and function.

Complete Lower Build Kits

Got a barreled upper assembly that you're ready to put to work? We have the critical other half your custom AR build available in our complete lower build kits. These units ship with parts kits, a buffer assembly and stock or brace (for rifles and pistols) and an 80% lower that you get to fabricate to make a truly custom, from-scratch stripped lower receiver.

AR Stocks and Pistol Braces

Getting a good cheek weld and having a lil' extra comfort behind the gun can help make shooting your AR rifle or pistol even better. We've sourced some of the most popular AR stock and brace options for any setup, all available at a great price. Need a conventional six-position buttstock? Grab an O.G. M4-type stock for only $10! Need to outfit your lower receiver with a full buffer assembly, too? Check out our available stock an brace kits.

Upgraded Pistol Grips

Let's face it: The AR's stock pistol grip gets the job done, but it's outdated. New grips with better angles and materials can make a world of difference in how you maneuver and aim with your black rifle. We've got some of the most popular options from Magpul and UTG, with over-molded grips also available for large hands and better comfort. Check 'em out here.

AR Slings and Sling Mounts

Most new AR builders are so excited to part together their new rifle or pistol, they forget one of the most important accessories: A proper sling. We've got comfortable, battle-ready options from Magpul and others, with easy-to-install sling mounts and plates that make hanging your AR off your sling - and getting it into the high-ready position - natural and smooth.

Other AR-15 Accessories

 Looking for that one way to improve your AR like nobody else? That one accessory that makes your rifle or pistol shoot better, provide easier control, or simply more mag access? Check out our AR accessories. We've got some one-off upgrades like 9mm conversion blocks, double mag holders, the infamous B.A.D. lever for quicker mag swaps, and quality rifle cases.


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.