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    AT3™ PROMOD-K Keymod AR-15 Free Float Handguard

    The AT3 PROMOD-K is a lightweight, durable, and easy-to-install Keymod AR-15 handguard at a price that won’t break the bank.

    The slim free-float design adds minimal weight while enhancing accuracy by keeping stress off the barrel. With its simple clamp-on design and 10”, 12” or 15” lengths, the PROMOD-K is the perfect upgrade for your existing rifle, or the centerpiece of your next AR-15 build.

    Lightweight & Durable

    • Unique lightweight, slim design with Keymod attachment points at the 3, 6, 9, & 12 o’clock positions
    • Rock-solid 6061 aircraft aluminum handguard that withstands the harshest treatment
    • Top rail aligns with AR-15 flat-top upper receivers for perfect alignment of optics, iron sights, and other accessories
    • Handguard clamps securely onto the included steel barrel nut using steel mounting hardware to assure a secure fit with zero movement
    • Backed by the AT3 Lifetime Warranty

    Impeccable Fit and Finish

    • Stealthy matte-black anodized finish provides a durable corrosion-resistant surface that matches your existing parts.
    • Precision CNC milled Keymod and MIL-STD-1913 (Picatinny) rail slots assure proper fit for all your accessories
    • Machined vent holes reduce weight and keep the handguard cool, even after a long day at the range.
    • One 5-slot Keymod-to-Picatinny rail section included

    Easy Installation

    • Simply install the barrel nut to the proper spec and clamp on the handguard – no “timing” or shims required.
    • Easily upfit your handguard with Keymod accessories – compatible with all Keymod products including rail sections, forward grips, rail panels, and more.
    • Installation questions? Check out the installation instructions for the PROMOD-K handguard

    IMPORTANT NOTEthe included barrel nut requires a 29mm or 1 3/16" wrench (not included). We recommend using a standard 8” length crescent wrench, 29mm or 1 3/16" box wrench, or 29mm / 1 3/16" crowfoot with torque wrench.

    More Information

    • Full kit - includes all mounting hardware and 1 Keymod 5-Slot Rail section – all included parts pictured below
    • Most rifle setups will require the use of a low profile gas block that sits under the handguard.

    Included in the box:

    • Handguard with steel barrel nut and all mounting hardware
    • 5-slot keymod-to-picatinny rail
    • Hex wrenches for handguard and rail sections

    AT3™ PROMOD-K Keymod AR-15 Free Float Handguard Hardware Grande


    • Rifle Type: AR-15 (If you have a .308 AR variant, check out our AR-10 / .308 page)
    • Material: 6061 Aircraft Aluminum
    • Included Rail Section: One Piece Aluminum Picatinny Rail Section - 3 3/8” Length, 5 slots
    • Finish: Hard-coat anodized (matte black)
    • Handguard inside diameter: 1 5/16”
    • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
    • Weight:
      • 10" Handguard – 5.4oz (handguard only) / 9.7oz (handguard + barrel nut)
      • 12" Handguard – 6.1oz (handguard only) / 10.4oz (handguard + barrel nut)
      • 15" Handguard – 7.3oz (handguard only) / 11.6oz (handguard + barrel nut)

    Frequently Asked Questions:

    Will this fit my AR-15?

    This handguard will work with the majority of mil-spec AR-15’s on the market. In most instances, it will also require the use of a low-profile gas block that fits underneath the rail.

    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.

    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 29mm wrench (an 8” crescent wrench will work, or a 29mm box wrench, or 29mm crowfoot wrench with torque wrench)
    • A torque wrench can be also be used to assure you stay in the AR-15 barrel nut torque range (30-80 ft lbs). Since this range is quite wide, a torque wrench may not be needed, but is recommended if you're not experience in torquing AR-15 barrel nuts.

    AT3™ PROMOD-K Keymod AR-15 Free Float Handguard

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      Customer Reviews

      Based on 14 reviews
      Awesome and amazing.

      Love this handguard. Looks amazing and I'm so happy I decided to go with it. So light it adds no weight to my build.

      Glad to hear you're satisfied with your new handguard. Thanks for the feedback, Terry! -- LM
      Promod-K handguard

      I am super happy with this product. Quality and very easy installation. Looks great and lifetime warranty, why wouldn't you buy it!

      We really do our best to deliver not only quality products, but quality experience as well. We are glad you liked your new handguard, Eric! --LM
      15” K-Mod slim rail

      First, shipping/delivery was very quick. Overall, this rail is lightweight, sturdy, & looks mean. It was easy to install. I haven’t attached any accessories to it yet. I am very pleased with my purchase.

      Thank you so much for your detailed review, Rick. We really appreciate you taking the time out to share your experience with us and we're glad everything is working out so far. We count ourselves lucky for customers like you. Cheers! -AB
      K-mod handguard 15"

      I love it ordering was super easy and the shipping was fast will be ordering from these guys again

      We really value your feedback, Kenneth. We're glad to hear you had an awesome experience with us! -- AB
      Quality product

      At first I was skeptical but after receiving my rail I was thrilled. This rail is a quality made part. Ordering was simple, shipping was fast and the product is more than I expected very light weight. Finish is excellent. Definitely something to consider if your looking for a bargain price but want something good.!!! I highly recommend these handguards.