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  • Enhanced Lower Parts Kit by Strike Industries

    Enhanced Lower Parts Kit by Strike Industries

    If your .223 or 5.56mm AR-15's lower parts kit is worn out needs replaced, or if you just want to refresh the controls on your rifle, you need to get the Strike Industries Enhanced Lower Parts Kit. It'll rejuvenate your lower assembly and also has the...

    $104.99
  • 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...

    $22.95
  • 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...

    $49.99
  • Sale
    MOE+® EPT SBA3 Lower Build KIt

    MOE+® EPT SBA3 Lower Build KIt

    If you're building an AR-15 in pistol configuration, we can help you complete the lower half of your rifle while keeping you legal at the same time. To help with this, we've assembled this MOE+® EPT SBA3 Lower Build Kit. It comes with everything you...

    Was: $263.99
    Now: $219.99
  • AR15 Enhanced Lower Parts Kit by Aero Precision

    AR15 Enhanced Lower Parts Kit by Aero Precision

    For your next AR-15 build, you should start your lower receiver with a quality lower parts kit, so you don't just end up replacing it later. With that in mind, Aero Precision gives you their AR-15 Enhanced Lower Parts Kit to start your build off in a...

    $114.99
  • Spike's Tactical Pro Grip Spike's Tactical Pro Grip-2

    Spike's Tactical Pro Grip

    Replace that uncomfortable mil-spec grip on your AR with the Pro Grip by Spike's Tactical. It's got an ergonomically correct feel, and it's been shaped and contoured to fit your hand's natural grip to make your hand and your AR fit together like they're...

    $24.99
  • Magpul MS4® Dual QD Sling GEN2 Magpul MS4® Dual QD Sling GEN2 2 Magpul MS4® Dual QD Sling GEN2 3 Magpul MS4® Dual QD Sling GEN2 4 Magpul MS4® Dual QD Sling GEN2 5

    Magpul MS4® Dual QD Sling GEN2

    The Magpul MS4 Dual QD Sling GEN2 includes two heavy duty push-button QD swivels and a slim MS1 slider for secure sling adjustments. The MS4 has an ability to easily switch between a one-point or two-point sling thanks to the customer steel connection...

    $74.99
  • M5 .308 Standard Lower Parts Kit by Aero Precision

    M5 .308 Standard Lower Parts Kit by Aero Precision

    If you plan to start an LR-308 build, you're gonna need a good lower parts kit. Aero Precision makes a lower parts kit designed for their M5, which is their own proprietarily designed .308 rifle that can also work with your LR-308 build, provided yours...

    $99.99
  • Sale
    AR15 LPK Pin And Detent Kit by KAK

    AR15 LPK Pin And Detent Kit by KAK

    The KAK Industry AR15 Pin And Detent Lower Parts Kit was manufactured with top of the line materials for the best quality parts. This kit is great for replacement parts, a new build, or having spare parts. This kit comes with a pivot pin, takedown pin,...

    Was: $23.99
    Now: $19.99
  • 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...

    $69.99
  • MOE-K2+® Grip – AR15/M4 by Magpul MOE-K2+® Grip – AR15/M4 by Magpul-2

    Magpul MOE-K2+® Grip – AR15/M4

    The Magpul MOE-K2+ Grip has a strong rubber mold wrapping around the durable polymer body, preventing snags and damage, which allows this grip to outlast in rugged environments. The MOE-K2+ offers a sharp vertical grip angle, naturally placing the...

    $24.95
  • 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...

    $12.95
  • ARQD100 AR-15 QD Backplate by Sylvan Arms ARQD100 AR-15 QD Backplate by Sylvan Arms

    Sylvan Arms AR-15 QD Backplate

    By now, you're surely aware of the benefits of using a QD sling for your AR-15, and you've landed here because you're looking to upgrade. You have the sling, but where do you attach it, and what if you're left handed? If you prefer to keep your AR close...

    $24.99
  • Drop-In Trigger - RA-140 Super Sporting Drop-In Trigger - RA-140 Super Sporting

    Drop-In Trigger - RA-140 Super Sporting

    "Man, I wish I had a kickass trigger for my AR, that didn't cost half what the entire rifle was worth." Ever thought this? Well stop wishing, and check out the RA-140 Super Sporting Trigger Assembly by Rise Armament. Use this step-by-step guide to...

    MSRP: $179.00
    $129.00
  • 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...

    $90.10
  • Aero Precision Enhanced Lower Parts Kit - M5, .308

    Aero Precision Enhanced Lower Parts Kit - M5, .308

    If you're planning an LR-308 build, a good lower parts kit is on your to-buy list. It'd also be nice if your lower parts kit came with a more comfortable grip than the standard A2 grip. Aero Precision makes a lower parts kit designed for their own M5, a ...

    $134.99
  • 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...

    $89.99
  • Sale
    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...

    Was: $107.99
    Now: $89.99
  • 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...

    $34.95
  • 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...

    $24.95
  • 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...

    $69.99
  • Sale
    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
  • 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...

    $64.99
  • Sale
    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...

    Was: $191.99
    Now: $159.99
  • Sale
    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
  • MOE+® AR15/M4 Grip by Magpul® MOE+® AR15/M4 Grip by Magpul® MOE+® AR15/M4 Grip by Magpul®

    MOE+® AR15/M4 Grip by Magpul®

    Magpul® has absolutely built a name for themselves over the years with their aftermarket AR parts and add-ons. Take their MOE® grip for your AR. It feels excellent, the grip angle is lightyears ahead of the standard A2 grip your AR probably came...

    $23.99

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.