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    We Ship Fast!

    Order by 1PM CST for Same Day Shipping (Mon-Fri)

    The AT3 T-Series is a classic free floating quad rail at a fraction of the price of the "big brands"

    Add an optional endcap for only $10 more by selecting it in the dropdown above ($14 value!)


    • "Monolithic" rail design - creates a continuous rail with a flat upper receiver. No gap!
    • Universal - fits with standard 1.25" barrel nut (upper receiver threads).
    • T-marked for easy accessory location
    • Mil-spec (MIL-STD-1913) picatinny on all 4 rails - 16 slots on top rail, 14 on other 3 rails
    • One-piece construction - rock-solid fit!
    • Will fit over most low-profile gas blocks (including the blocks that we sell)
    • Backed by the AT3 Lifetime Warranty
    • Compatible with piston kits (Adams Arms, more)
    • Requires some disassembly to install - check out our installation videos to see the process
    • Also available in 12 inch and 10 inch sizes
    • Everything in the pictures is included (rail, barrel nut, locking ring, set screw - endcap is optional)
    • Please note - this handguard is a little longer than the standard carbine handguard, so it must be used with a low profile gas block on any carbine. 


    • Please Note: These quad rails are made for standard AR-15's. If you have a 7.62/.308 AR variant, check our our AR-10 / 7.62 / .308 page.
    • Material: 6061 Aircraft Aluminum
    • Finish: Hard-coat anodized (black)
    • Length: 7" Carbine-Length
    • Inside Diameter: 1.75"
    • Weight: 11.7oz
    • Packaging: PE Bag
    • Included in the box: Quad Rail Handguard, Locking ring, Set Screw. Endcap is an optional add-on


    Q: How do I know if this will fit my AR-15?
    A: This will fit any AR-15 that has a standard mil spec upper receiver. It will require some modification to your firearm though, including replacing the barrel nut, removing the flash hider, and possibly adding a low profile gas block. Want to learn more? Watch some installation videos.

    Q: Do I need to buy anything else?
    A: For longer handguards you may need to replace the gas block or front sight with a low profile gas block, available here. These gas blocks are low enough to sit under the quad rail. (Since this is a 7" handguard, you should be able to skip this step).

    You will also need to get an armorer's wrench for the barrel nut, and we highly recommend a vise block to hold the upper receiver in place while you work on the weapon. Get armorer's tools here.

    Q: Will this work with my AR-10/.308?
    A: No - these quad rails are made for standard AR-15's. If you have a 7.62/.308 AR variant, check our our AR-10 / 7.62 / .308 page.

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    Customer Reviews

    Based on 29 reviews
    Great Upgraded Handguard for my Smith & Wesson MP-15

    AT3 Tactical's 7" handguard was installed today by my gunsmith and it looks great. A real solid piece of gear and a real value. I also have nothing but great things to say about AT3 Tactical's customer service. I highly recommend them and will very likely purchase from them again in the future. My gunsmith was impressed with the quality. Took about 15 minutes to completely install.

    AT3 Carbine free floating hand guard

    A well made item worth the price but lacks instructions. It helped to YouTube the installation video.

    We are sorry an instruction sheet wasn't included in your order. Never the less, we are glad that you are pleased with the handguard.
    Free float handguard

    Well, I'm not so sure. First of all, I bought the carbine length hand guard. I bought the small gas port to fit under the hand guard. I bought the front end cover to go with it. Waste of money, as the front cover hits the gas port, and I can't use the front cover. Then, the hand guard gets locked up to the barrel nut with a lock ring. The ring is 2" in diameter, and I don't have a spanner wrench to fit (and you should see my tool collection!) It calls for lock tite (I'm going go start with blue, but it might need red.) I don't like putting locktite on my guns... We'll see how it works out.

    Carbine-7.5 inches long!

    Be advised-the overall length of this hand guard/rail is 7.5 inches. It says it is for a carbine, but it would not fit on my Windham Weaponry AR-15 SRC with a high profile gas block. It is a well made quality rail. Shipping for AT3 was very fast and the customer support at AT3 was excellent! Laura was very knowledgeable, helpful, and understanding in addressing my issues and questions. She had a return authorization e-mailed to me before I was off of the phone. If you have a low profile gas block, it should work without the end cap.

    Good quality product for a fair price

    This product is well made. Clear markings and the finish is beautiful! Arrived within days of placingy order. Good company great prices. Can't beat that combo!