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  • Magpul® MS3® Single QD Sling GEN2 - Black Magpul® MS3® Single QD Sling GEN2 - Black 2 Magpul® MS3® Single QD Sling GEN2 - Black 3

    Magpul® MS3® Single QD Sling GEN2 - Black

    A rugged single-point and two-point sling, made in the USA. A sling is a functional piece of equipment that should allow you to come to a quick high-ready to assist with some well-placed shots. Magpul is well aware of this. That's why the Gen 2 MS3®...

  • 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...

  • 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...

  • 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...

  • 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...

  • .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...

  • 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...

  • 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...

  • 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...


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.