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105 of 105 Items
  • 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
  • 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...

    $23.70
  • MOE+® Grip – AR15/M4 by Magpul

    MOE+® Grip - AR15/M4 by Magpul®

    The Magpul MOE+ Grip has a reinforced rubber mold wrapping around the polymer body, allowing for maximal comfort and weapon control. This durable material prevents snags and damage, allowing this product to be dependable in rugged environments. The MOE+...

    $22.75
  • QMS Quality Mil-Spec Trigger by ALG Defense

    ALG Defense QMS Quality Mil-Spec Trigger

    There are some who prefer their AR platform rifles traditional or built as close to mil-spec as possible. They enjoy replicas of the Colt model 629 or of the old-school M-16, because they want that nostalgia when they shoot. But there's one problem: the...

    $49.00
  • PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit

    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit

    Here's the one-stop-shop for building a highly efficient and ergonomic lower for your next AR-9 pistol. This ensemble features parts from some of the best brands out there. First of all, you get the Magpul MOE trigger guard and pistol that will make...

    $189.99
  • 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...

    $114.99
  • 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
  • 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...

    $71.20
  • 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
  • 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...

    $39.95
  • 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
  • Magpul QD Sling Swivel

    Magpul® QD Sling Swivel

    The Magpul QD Sling Swivel is a quick detachable manganese-phosphate finished steel design, that is compatible with any push-button 1-1/4 inch webbing for QD sling attachment points, including the two-point MS1 Sling.  Additional...

    $14.95
  • 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
  • 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...

    $18.95
  • RA-535 Advanced Performance Drop-In Trigger RA-535 Advanced Performance Drop-In Trigger RA-535 Advanced Performance Drop-In Trigger

    RA-535 Advanced Performance Drop-In Trigger

    Your search for the ultimate AR trigger means discovering a quality unit that eliminates the worst traits found on some triggers. You'll want to minimize take-up - that loose, dangly feeling you notice before putting pressure on your trigger...

    $259.00
  • 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
  • UTG® Single Point Bungee Sling with QD Sling Swivel UTG® Single Point Bungee Sling with QD Sling Swivel 2 UTG® Single Point Bungee Sling with QD Sling Swivel 3

    UTG® Single Point Bungee Sling with QD Sling Swivel

    Single point slings allow professional shooters the ability to keep their AR15 rifle on the ready, and with the UTG® Single Point Bungee Sling, you get just that, plus a few added bonuses. Along with the ease of handling your rifle, this sling...

    $25.99
  • Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    Bravo Company AR-15 Trigger Assembly - PNT, Nickel

    It's time to get in the game with your AR's trigger. Two words: Bravo Company. And this is their PNT Trigger Assembly. Yeah, it's been given a nickel finish, but it doesn't stop there. The interacting surfaces of its parts have also been coated in...

    $69.95
  • Single Stage Drop-In Trigger Single Stage Drop-In Trigger-2 Single Stage Drop-In Trigger-3 Single Stage Drop-In Trigger-4 Single Stage Drop-In Trigger-5

    Single Stage Drop-In Trigger

    The trigger or "fire control group" as it's officially called, is one of your AR's most basic parts. And sure, there are a ton of flavors out there from who knows how many brands ironically with several takes on what constitutes "mil-spec" that will all...

    $159.99
  • 5/8 x 24 RH FATman Hex Brake by Phase 5 Weapon Systems 5/8 x 24 RH FATman Hex Brake by Phase 5 Weapon Systems

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

    If you're a person who does a lot of high-performance shooting, then you want to lessen the recoil as much as possible while still maintaining a level barrel for optimal accuracy. The people at Phase 5 Weapon Systems are well aware of this. That's why...

    $138.00
  • .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...

    $106.80
  • 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...

    $54.99
  • MIAD Mission Adaptable Grip by Magpul MIAD Mission Adaptable Grip by Magpul

    Magpul® Adaptable Grip - MIAD Mission

    Got a preference for the way you think your AR grip should feel? Sure, anything but the original mil-spec grip, right? We hear ya. Fortunately for you, Magpul heard ya too. That's why there's the MIAD, the Mission Adaptable grip for your AR. It's just as...

    $34.15
  • 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
  • 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...

    $7.55
  • Premium AR-15 Lower Parts Kit Premium AR-15 Lower Parts Kit 2 Premium AR-15 Lower Parts Kit 3 Premium AR-15 Lower Parts Kit 4

    Premium AR-15 Lower Parts Kit

    A lower parts kit is a key part to finishing your lower. It's one of the most important aspects of your AR-15 as far as quality is concerned. This lower parts kit offers all the parts needed to finish your stripped receiver. You'll also need an upper...

    $64.99
  • AR9 Buffer Tube Assembly

    AR9 Buffer Tube Assembly

    Whether you're replacing an old part or getting started on a brand new build, we've got you covered with the AR9 buffer tube assembly kit. The buffer tube is forged from 7075-T6 aluminum which makes it very light and tough as hell. It's even compatible...

    $44.99
  • 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...

    $91.79
105 of 105 Items

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.