SHIPPING SAME DAY OR NEXT BUSINESS DAY

phone: 888-310-0284
36 of 122 Items
  • Sale
    ar-15-fully-stripped-upper-receiver-1 ar-15-fully-stripped-upper-receiver-2 ar-15-fully-stripped-upper-receiver-3 ar-15-fully-stripped-upper-receiver-4 ar-15-fully-stripped-upper-receiver-5

    AR-15 Fully Stripped Upper Receiver

    This stripped upper receiver is made from 7075-T6 aluminum and conforms to all mil-spec measurements. Being the A3 type, it also features a "flat top." This means instead of the old-school carry handle that the A2 style used to have, you get a...

    Was: $57.99
    Now: $52.99
  • Sale
    PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 1 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 2 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 3 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 4 PSA 9MM SBA3 MOE EPT Pistol Lower Assembly Kit 5

    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...

    Was: $299.99
    Now: $189.99
  • Sale
    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...

    Was: $91.79
    Now: $59.99
  • Sale
    .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...

    Was: $106.80
    Now: $89.99
  • Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    Mil-Spec AR15 Lower Parts Kit (w/ Hammer and Trigger)

    This LPK offers the parts needed to finish your lower, and for a fraction of the cost of a "retail" bought assembly. This lower parts kit comes with all the internal parts needed to finish your lower, from the pivot pin to the trigger. With this kit...

    $39.99
  • Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly Adjustable Carbine Stock & Buffer Tube Assembly

    Adjustable Carbine Stock & Buffer Tube Assembly

    This butt stock kit includes both an adjustable carbine stock and buffer tube assembly. The adjustable carbine stock is constructed from a durable polymer composite and is designed for quick adjustment. Additionally, this carbine butt stock offers three...

    $39.99
  • ar-15-buffer-tube-assembly-mil-spec-1

    Mil-spec AR-15 Buffer Tube Assembly

    The AR-15 Mil-Spec Buffer Tube Assembly is made out of durable 6061-T aluminum, making this product very lightweight. The 3-ounce buffer and carbine coated spring ensure a smooth and reliable operation. The mil-spec six position receiver extension allows...

    $29.99
  • Magpul PMAG AR/M4 GEN 2 MOE 5.56/223 AR/M4 30rd Magazine - MAG571-BLK Magpul PMAG AR/M4 GEN 2 MOE 5.56/223 AR/M4 30rd Magazine - MAG571-BLK 2

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

    Magpul brings to you the PMAG 30 GEN2 MOE, a top tier product sold at an affordable price. With a polymer build that allows for a construct that is both lightweight and extremely tough, this magazine can take a beating without weighing you down. It also...

    $12.99
  • AR15 LPK - Missing Parts Kit

    AR15 LPK - Missing Parts Kit

    The AR15 Missing Parts Kit is perfect for any lost parts, replacement parts, or for your next custom build. What's Included? Buffer retainer (1) Bolt catch spring (2) Bolt catch detent (1) Selector detent (2) Disconnector spring (2) Buffer retainer...

    $9.99
  • ar-15-butt-stock-mil-spec-1

    Mil-spec AR-15 Butt Stock

    The AR-15 Mil-Spec Butt Stock is a heavy-duty six-position collapsible stock with built in sling swivel, composed out of high quality reinforced plastic composite. Additional Features: Mil-spec dimensions (commercial variant) Can accomodate six-position...

    $13.99
  • D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 2 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 3 D&H AR/M4 5.56/223 30rd Aluminum Magazine - Black 4

    D&H AR/M4 5.56/223 30rd Aluminum Magazine

    If it's a classic look you're after, then D&H has got you, with few improvements to boot. This AR15 magazine is crafted from heat treated aluminum and is coated in Teflon so that it is gauranteed to last and is protected from corrosion and is...

    $12.99
  • Magpul® MOE® Carbine Stock & Buffer Tube Assembly Magpul® MOE® Carbine Stock & Buffer Tube Assembly 2 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 3 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 4 Magpul® MOE® Carbine Stock & Buffer Tube Assembly 5

    Magpul® MOE® Carbine Stock & Buffer Tube Assembly

    Get all the pieces you need to finish off the shoulder end of your AR in one handy little package. This bundle we've created gets you our buffer tube assembly, but that's not all. The bonus is that we've included a Magpul® MOE® Carbine Stock...

    $69.99
  • AR15 Tapered Steel Crush Washer 1/2"x28 AR15 Tapered Steel Crush Washer 1/2"x28 2

    AR15 Tapered Steel Crush Washer 1/2"x28

    If you plan on going the standard (and the easiest) route with the muzzle end of your .223 or 5.56mm chambered AR by installing a muzzle device, you'll need a crush washer. This is the one you need. You just slide it onto the threading of your barrel,...

    $1.59
  • JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 2 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 3 JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber 4

    JMT Single Stage Drop-In 3.5-4 Ib Trigger - Saber

    If you're wanting a simple and effective upgrade to your AR to get you into that better-than-mil-spec territory with your trigger, then stop here and read this. You need to check out the Saber. It's JMT's Single Stage Drop-In 3.5-4 lb Trigger, and it'll...

    $99.95
  • AR-15 A2 "Birdcage" .223/5.56mm Flash Hider AR-15 A2 "Birdcage" .223/5.56mm Flash Hider 2

    AR-15 A2 "Birdcage" .223/5.56mm Flash Hider

    Your AR-15 needs a reliable muzzle device right out of the gate to finish off your build. The AR-15 A2 "Birdcage" .223/5.56mm Flash Hider is the jack of all trades when it comes to AR muzzle devices. Due to its 5-port design, it'll conceal the flash,...

    $8.99
  • AR15 LPK - Basic Build Kit

    AR15 LPK - Basic Build Kit

    This AR15 Basic Lower Parts Kit includes all of the basic necessities needed for your own custom build. Most importantly what comes with this kit are the following, a bolt catch kit, magazine catch kit, takedown pin & detent & spring, pivot pin...

    $26.99
  • Magpul® Angled Foregrip - Black - M-lok

    Magpul® Angled Foregrip - Black - M-lok

    MagPul continues their reign of tradition, excellent quality, and innovation with this M-Lok Angled Foregrip. This triangle grip is perfect for large or small hands, with its new and improved sleek design. Aiding in muzzle control, this AR-15 foregrip is...

    $25.60
  • AR10/AR15 Carbine Length Gas Tube

    AR10/AR15 Carbine Length Gas Tube

    If you want your AR-15, LR-308, or AR-10 to cycle ammo reliably, it needs a quality gas tube. This gas tube is compatible with all AR-type rifles and pistols configured with a carbine-length gas system. Use this instructional guide for installing your...

    $11.99
  • UTG® Quick Install Dust Cover -  .223/5.56,  Black UTG® Quick Install Dust Cover -  .223/5.56,  Black 2 UTG® Quick Install Dust Cover -  .223/5.56,  Black 3 UTG® Quick Install Dust Cover -  .223/5.56,  Black 4 UTG® Quick Install Dust Cover -  .223/5.56,  Black 5

    UTG® Quick Install Dust Cover - .223/5.56, Black

    Installing a dust cover onto your AR's upper receiver can be a major hassle. If you're starting with just individual parts, you need to snap the C-clamp onto the rod without launching the damned thing across the room and never seeing it again. Then you...

    $9.99
  • AR15 A2 Birdcage Flash Hider by Aero Precision

    AR15 A2 Birdcage Flash Hider by Aero Precision

    If you plan to build your own AR-15, and you don't intend to use any specialized type of muzzle device, then the Aero Precision AR15 A2 Birdcage Flash Hider is a good direction in which to head. While it won't outright beat out any specialized muzzle...

    $6.79
  • AR15 Ergonomic Pistol Grip by UTG®

    AR15 Ergonomic Pistol Grip by UTG®

    The UTG® AR15 Ergonomic Pistol Grip features a non-slip texture, palm swell, and thumb rest for maximum comfort and stability. The grip angle offers easy accessibility to the trigger along with increasing shooting accuracy for optimal performance. In...

    $10.99
  • 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
  • LR-308/AR-10 Buffer Tube Assembly

    LR-308/AR-10 Buffer Tube Assembly

    If your in the market for buffer tube assembly kit, get yourself a kit that will guarantee longevity. Forged form 7075-T6 aluminum, the buffer tube is not only lightweight, but is extremely durable as well. It's also compatible with most aftermarket...

    $39.99
  • AR15 Low-Profile Gas Block - .750" AR15 Low-Profile Gas Block - .750" 2 AR15 Low-Profile Gas Block - .750" 3

    AR15 Low-Profile Gas Block - .750"

    Every gas-operated AR (those that don't use a piston system) uses a gas block of some type to cycle between shots. If you're building one of those old-school or retro style AR, yours may have a fixed front sight that doubles as the gas block or some...

    $14.99
  • 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...

    $19.97
  • 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...

    $19.99
  • RVG® - Rail Vertical Grip by Magpul

    Magpul® RVG® - Rail Vertical Grip

    The Magpul RVG is a traditional vertical grip made out of durable polymer that is lightweight and has a low profile. The aggressive TSP texture allows for more control in any rugged environment. The RVG is designed to be used with the 1913 Picatinny rail...

    $23.70
  • 300 Blackout Pistol Buffer Tube Kit - 3 oz Buffer

    300 Blackout Pistol Buffer Tube Kit - 3 oz Buffer

    Finish your 300 BLK AR build with the right buffer. Getting supersonic and subsonic 300 Blackout loads to reliably cycle in your AR pistol requires dialing in your gas system and your buffer weight. This lightweight buffer kit includes a 3.0-ounce...

    $34.99
36 of 122 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.