FAST SHIPPING! SHIPS IN 3-5 BUSINESS DAYS!

phone: 888-310-0284
36 of 126 Items
  • 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...

    $38.99
  • 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...

    $12.30
  • AR15 LPK - Missing Parts Kit by KAK

    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
  • 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
  • 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
  • Magpul® MOE® AR-15 Build Kit Magpul® MOE® AR-15 Build Kit 2 Magpul® MOE® AR-15 Build Kit 3 Magpul® MOE® AR-15 Build Kit 4 Magpul® MOE® AR-15 Build Kit 5

    Magpul® MOE® AR-15 Lower Build Kit

    We don't want to say this is the kit to end all kits, because that would be too cliché. So we'll just tell you this is the kit to end the lower half of your AR build. If you got your hands on a stripped lower and you're ready to build, this kit...

    $134.99
  • 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
  • AR-15 A2 "Birdcage" .223/5.56mm Flash Hider by Aim Sports AR-15 A2 "Birdcage" .223/5.56mm Flash Hider by Aim Sports

    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
  • 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
  • LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    LR-308/AR-10 Lower Parts Kit (w/ Hammer and Trigger)

    We strive to provide the most accurate photographs of our product whenever possible. Due to availability limitations and supply chain constraints, slight variations of the trigger and hammer finsh (stainless or black) may occur.  If you're looking...

    $63.99
  • 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 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
  • 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
  • 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
  • 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
  • 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...

    $9.99
  • 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
  • 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
  • Sure Grip for AR-15/M-16 by Ergo Grip Sure Grip for AR-15/M-16 by Ergo Grip

    Sure Grip for AR-15/M-16 by Ergo Grip

    If you frequently use your AR for long durations, then comfort is key. You need to remove the potential for fatigue in your grip hand. With that in mind, Ergo Grip gives your their Sure Grip for AR-15/M-16. First, it's been contoured and shaped for max...

    $21.55
  • RA LE145 Tactical Drop-In Trigger RA LE145 Tactical Drop-In Trigger

    RA LE145 Tactical Drop-In Trigger

    If you're the operator, LEO, or hunter that needs one of the most upgraded and dependable triggers available, the LE145 Tactical Trigger from Rise Armament should be your top choice. This drop-in, single-stage trigger maintains a slightly more robust 4...

    MSRP: $199.00
    $129.99
  • ACT Advanced Combat Trigger by ALG Defense

    ACT Advanced Combat Trigger by ALG Defense

    Got an preference for AR builds reminiscent of those from a previous era? We do too. But like us, you're probably just not a fan of the mil-spec trigger. It's gritty and has a rough pull, and it generally feels like crap. But there's a way to keep that...

    $69.00
36 of 126 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.