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

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

    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


    • 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. 

    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)

    Have Questions About this Product?

    Ask Us Now

    Customer Reviews

    Based on 5 reviews

    12" mlok super easy to install ,looks great,help from at3 was outstanding

    15" mlock handguard

    Easy to install and looks great. Nice and light as well.

    15" mlock handguard

    Had my local gunsmith install this guard and ran a match with it a couple of days later. I was well pleased with the performance and weight. Aesthetics and function are top notch as well. I recommend that anyone considering using this guard go ahead and make the decision. Great price point, shipping and customer service.

    Very happy

    Got the 15 inch versiona and my local gunsmith installed it for me, and I love it. Big upgrade to my MP15 that had the plastic handguards before. Surprisingly lightweight for how long it is. A+


    Like the looks, feel not so much. Edges are sharp. Extended bare handed firing could be dangerous and require a first aid kit.