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    Based on the popular M-LOK™ platform, the AT3 PROLOK Free Float AR 15 Handguard is a lightweight, durable, and customizable M-LOK handguard at an excellent price.

    AT3 PROLOK Free Float AR 15 Handguard

    The slim free-float design enhances accuracy, while minimizing the weight of your rifle. M-LOK attachment slots and 2 included rail sections provide unlimited options for accessorizing your build.

    With 10”, 12” or 15” lengths available, the PROLOK handguard is ideal for customizing your next AR-15 build, or upgrading an existing rifle.

    Lightweight & Durable

    • Unique slim and lightweight M-LOK design with M-LOK attachment points at the 3, 6, 9, & 12 o’clock positions
    • Durable 6061 aircraft aluminum alloy construction – designed to take a beating
    • Picatinny/M-LOK top rail perfectly aligns with AR-15 flat-top upper receivers
    • Handguard screws 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


    • Easily upfit your handguard with M-LOK accessories – compatible with all M-LOK products including rail sections, forward grips, hand stops, rail panels, and more
    • Available in 3 lengths (10”, 12”, and 15”) to accommodate a variety of build types
    • Precision milled M-LOK and Picatinny  (MIL-STD-1913) rail slots assure proper fit for attachments. Two 3-slot M-LOK-to-Picatinny rail sections included

    Exceptional Fit and Finish

    IMPORTANT NOTEthe barrel nut requires a 30mm (1 3/16”) wrench (not included). Most AR-15 Armorer’s wrenches will work for this, or we recommend using an armorer’s wrench or 30mm (1 3/16”) crowfoot with torque wrench.

    More Information

    Full kit - includes all mounting hardware plus two M-LOK 3-Slot Rail sections – all included parts pictured below. 

    AT3 PROLOK M-LOK AR 15 Handguard Full kit showing all mounting hardware plus two M-LOK 3-Slot Rail sections

    Note: 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, two 3-slot M-LOK to-picatinny rails, barrel nut shims, and hex wrenches for handguard and rail sections


    • Rifle Type: AR-15 (If you have a .308 AR variant, check out our AR-10 / .308 page)
    • Material: 6061 Aircraft Aluminum
    • Included Rail Sections: Two Aluminum Picatinny Rail Sections - 1 3/4” Length, 3 slots
    • Finish: Hard-coat anodized (matte black)
    • Handguard inside diameter: 1 3/8”
    • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
    • Weight: BN 3.9oz
      • 10" Handguard – 7.5oz (handguard only) / 11.4oz (handguard + barrel nut)
      • 12" Handguard – 8.5oz (handguard only) / 12.4oz (handguard + barrel nut)
      • 15" Handguard – 10.3oz (handguard only) / 14.3oz (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
    • 30mm (1 3/16”) wrench - most AR-15 Armorer’s wrenches will work for this, or a 30mm (1 3/16”) crowfoot
    • A torque wrench to assure you stay in the AR-15 barrel nut torque range while timing the barrel nut (30-80 ft lbs)

    AT3™ PROLOK M-LOK™ AR-15 Free Float Handguard Night Shot

    Have Questions About this Product?

    Ask Us Now

    Customer Reviews

    Based on 11 reviews

    This is a quality product for a fair price. Light weight and customizable to your needs.

    Thank you for your feedback, Stefan!
    Wonderfully fast shipping

    The tracking and shipping of my items was spot on!! I would highly recommend AT3 Tactical online ordering to anyone.

    Thank you for the feedback Jake! We appreciate it.
    Rusty barrel nut that won't take a wrench

    Inferior nut has ruined what could be a good product. The nut came with dirty, rusty threads that had to be cleaned out prior to installation. The install instructions came with a fuzzy little picture that is truly worthless. Basically you need to eyeball it until the screw holes are aligned. Which will never happen with mine. I only got two shims, and it doesn't align with 0, 1 or 2. Not that you can get a good torque wrench on it anyway. A 1-3/16 wrench is going to be thick. The flats on the round nut are too thin to fit the wrench. The flats are too thin for my armorers wrench too. Now I need to get a cheap wrench somewhere and grind it thin enough to fit the nut.... after I go buy nut shims. The only reason it got 1 star is the handguard would be nice if it could be installed. The nut makes this a ZERO star product.

    Thank you for your feedback John and for working with us through our support@at3tactical.com address. We're glad you could make a product that didn't meet our standards work for your son's rifle, and we appreciate the alert to screen our inventory for similar issues.
    10 inch ProLok Handguard

    Received the handguard within promised time and in good condition. All parts were included to complete the installation. I am very much satisfied with the ProLok handguard and the look is awesome. Now I have a platform for additional accessories.

    We are glad to hear that you are pleased with the quality of our product and overall design.

    Installed this on my ar 15 last week, it's beautiful! Fit is perfect and looks awesome. My gunsmith liked it so much I ordered him one.

    We are glad to hear that you are pleased with your purchase.