AT3™ Pro Quad Rails – Free Float AR15 Handguards – 4 Lengths Available

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The New and Improved Pro Quad Rail – Lightweight, Rigid, and Easier to Install

The quad rail is still the gold standard of secure accessory mounting, but they’re in desperate need of a reboot. That’s what we offer with the AT3 Pro Quad Rail.  It uses the same simple installation as our SPEAR M-LOK handguard, has plenty of lightening for maximum comfort, and it works with Mil-spec uppers, as well as our Billet Upper to match the sleek contours.

AT3 Pro Quad Rail


The Pro Series Rail comes in 7″, 9″, 12.5″, and 15″ inch lengths, making it ideal for upgrading existing guns or starting fresh with specialized AR15 builds. If you’re planning a build without a Front Sight Base, make sure you pick up a Low Profile Gas Block with the handguard.

Solid and Secure Mounting

  • This rail is lightened down all four sides of Picatinny Rail, making it lightweight while still remaining solid for all your favorite accessories
  • 5 Integrated non-rotating QD Sockets for a variety of sling configurations
  • Durable 6061 aircraft aluminum alloy construction – designed to take a beating
  • Picatinny top rail perfectly aligns with AR-15 flat-top upper receivers, both forged and our AT3 Billet Upper
  • Handguard uses screws to clamp around the barrel nut, with anti-rotation tabs and anti-slip screws that ensure a rock-solid lockup

Simple Installation

  • Installs easily, just like our SPEAR M-LOK rail – you’ll only need a few simple tools to get the rail installed. Click here to view our instructions.
  • Perfect for assembling a new build or upgrading an existing rifle – it’s compatible with most mil-spec upper receivers on the market
  • Once you’ve got it installed, you’ll have plenty of room for any Picatinny rail accessories like lights, foregrips, lasers, or bipods
  • Seriously, it’s easy. Check out our video below for a guide on the complete installation.

AT3 Quad Rails are Compatible with the AT3 Billet Upper and Standard Forged Uppers

Exceptional Fit and Finish

  • Durable matte-black anodized finish resists scratches and provides an attractive surface that matches the rest of your build
  • Vented rails on all 4 sides reduce weight and help dissipate heat from shooting
  • Scalloped rails and clean lines for a unique look that flows into the AT3 Billet Upper
  • Proudly made in the USA
  • Backed by the AT3 Lifetime Warranty

Torture Test by FocusTripp!

More Information

Full kit – includes handguard with all mounting hardware, barrel nut, and barrel nut wrench.

AT3 Pro Quad Rail

If You’re Keeping Your Front Sight Base:

The Pro Quad Rail will work with your build! Use the appropriate length rail for your gas system:

  • Carbine Length – 7″ Pro Quad Rail
  • Midlength – 9″ Pro Quad Rail
  • Rifle Length – 12.5″ Pro Quad Rail

Included in the box:

    • AT3 Pro Handguard
    • 7075 T6 Aluminum Barrel Nut
    • Mounting Hardware with Allen Wrenches
  • Barrel Nut Wrench


  • Rifle Type: AR-15 (If you have a .308 AR variant, check out our AR-10 / .308 page)
  • Handguard Material: 6061-T6 Aluminum
  • Cerakote Finishes
    • Flat Dark Earth: H-267 Cerakote Magpul® Flat Dark Earth
    • OD Green: H-232 Cerakote Magpul® OD Green
    • Gray: H-188 Cerakote Magpul® Stealth Grey
    • Pink: H-224 Cerakote SIG™ Pink
    • Burnt Bronze: H-148 Cerakote Burnt Bronze
    • Tungsten: H-237 Cerakote Tungsten
    • Titanium: H-170 Cerakote Titanium
    • Red: H-167 USMC Red
  • Handguard inside diameter: 1.35”
  • Barrel Nut Material: 7075-T6 Aluminum
  • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)


  • 7″ Handguard – 9 oz
  • 9″ Handguard – 12 oz
  • 12″ Handguard – 15 oz
  • 15″ Handguard – 1 lbs 2oz

Actual Handguard Length

  • 7″ – 7″
  • 9″ – 9″
  • 12.5″ – 12.5″
  • 15″ – 15.0″

Frequently Asked Questions:

Will this fit my AR-15?

The Pro Quad Rail, like the SPEAR,  is designed for use with our matching Billet Upper Receiver as well as the majority of mil-spec AR-15 uppers on the market. It

This product will not work with non-milspec upper receivers like the Bushmaster Carbon due to the non-standard barrel threads, and it is not compatible with most piston kits as they won’t fit under the handguard. Additionally, this rail will not work with gas blocks that are irregularly shaped or exceed 1.3 inches in height or width.

We’re always glad to verify the fit for your rifle, just contact us! And if it doesn’t fit, we are glad to return it for you. And if you’re new to AR-15, we recommend watching a couple of the videos on our installation video page to understand how the process works.

What tools and additional parts are required?

For parts – most setups will require a low profile gas block.

For tools – we recommend:

  • A vise and non-marring vise block for holding the upper
  • A torque wrench and breaker bar to assure you stay in the AR-15 barrel nut torque range while timing the barrel nut (30-60 ft lbs)
  • Blue loctite for the mounting screws

Products available on this page:

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 277 reviews

Easy install and the rails have fit every attachment I’ve put on so far.

Thank you for your review! We are glad to hear that our AT3 Pro Quad Rails were easy to install and have accommodated all of your attachments. We appreciate your feedback and hope you continue to enjoy our product. Happy shooting!

Jacob Clark
Great quality product at a fantastic price.

I am very impressed with AT3 tactical. The quality of the hand guard is fantastic and they shipped it very quickly. I will be recommending them to everyone who is interested in building an AR!

Thanks for sharing your feedback! We're glad you are satisfied with your purchase!

Adam Benavidez
Great quality

I recieved the rail faster than expected and it mated up to my upper really nice I’d definitely would buy another or another AT3 rail!

anti-rotation tabs

Overall this is a really nice handgaurd & feels well made! Unfortunately due to the anti-rotation tabs at the end of the handguard it’s not allowing me to have it flush on my upper & leaves a nasty gap in between. Wish they had one without the anti-rotation tabs so sadly I’ll be returning

Ray Julian
15” Quad rail hand guard/ low profile gas block

Great product, great price, super fast shipping and my AR looks Bad A!!s I love it Thanks AT3

Thanks for the great review! We're glad to hear you're enjoying our product.