AT3™ SPEAR M-LOK Handguard for AR-15 – 9, 12, & 15 inch Lengths

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AT3 M-LOK Rail Covers - 3-Pack - Retro - Black

3-Pack AT3 M-LOK Rail Cover - Flag - Black


AT3 M-LOK Rail Covers - 3-Pack - Retro - Black

AT3 M-LOK Rail Covers – Retro & Old Glory Design – 2 Colors Available

AT3 M-LOK Rail Covers - 3-Pack - Retro - Black

3-Pack AT3 M-LOK Rail Cover - Retro - Flat Dark Earth


AT3 M-LOK Rail Covers - 3-Pack - Retro - Black

AT3 M-LOK Rail Covers – Retro & Old Glory Design – 2 Colors Available

The AT3 SPEAR™ is our best, most secure handguard. Simple to install, lightweight, and easy on the wallet.

The slim free-float design enhances accuracy while minimizing the weight of your rifle. M-LOK attachment slots and included rail section provide unlimited options for accessorizing your build. And with an available Billet Upper to perfectly match the slim profile, the SPEAR (Slim Profile Ergonomic Adjustable Rail) creates a unique look to set your rifle apart.

With 9″, 12”, or 15” lengths available, the SPEAR handguard is ideal for customizing your next AR-15 build or upgrading an existing rifle. If you’re starting from a stock rifle, make sure you purchase a Low Profile Gas Block with the handguard.

Lightweight & Durable

  • Slim and lightweight M-LOK design, with attachment, points at the 3, 6, & 9 o’clock positions and lightened Picatinny rail at the 12 o’clock position
  • 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

Easy Install Rock Solid Clamp and Lock MountingAnti Rotation Tabs for Secure Fit on Both Forged and AT3 Billet Uppers

Easy to Install

  • Installs clean and secure with only a few simple steps – all you’ll need is a torque wrench, vise block, and vise. Click here to view our instructions.
  • Perfect for assembling a new build or upgrading an existing rifle – it’s compatible with most upper receivers on the market
  • Once you’ve got it installed, you’ll have plenty of room for M-LOK accessories and adapters
  • Seriously, it’s easy. Check out our video below for a guide on the complete installation.

Vented Design - Lightweight and reduces heatM-LOK and Picatinny Rails Hold All Your Accessories

Exceptional Fit and Finish

  • Durable matte-black anodized finish resists scratches and provides an attractive surface that matches the rest of your build
  • Vented top rail reduces weight and dissipates heat from shooting
  • Finger grooves down the length of the handguard provide a more ergonomic hold and a unique look
  • Fully dehorned and free of burrs and other sharp snag points
  • Proudly made in the USA
  • Backed by the AT3 Lifetime Warranty

Smooth Machining - No Sharp EdgesAT3 SPEAR M-LOK AR 15 Free Float Handguard proudly made in the USA

More Information

Full kit – includes all mounting hardware, plus one M-LOK 5-Slot Rail section and barrel nut wrench.

Full Kit - Rail, Hardware, and Tools

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 aluminum barrel nut and all mounting hardware, one 5-slot M-LOK to-Picatinny rail, hex wrenches for handguard and rail sections, and 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
  • Finish
    • Black: Type 3 Hardcoat Anodized
    • Flat Dark Earth: H-267 Magpul® Flat Dark Earth
    • OD Green: H-232 Magpul® OD Green
    • Gray: H-188 Magpul® Stealth Grey
    • Pink: H-224 SIG™ Pink
    • Burnt Bronze: H-148 Burnt Bronze
    • Tungsten: H-237 Tungsten
    • Titanium: H-170 Titanium
  • Handguard inside diameter: 1.35”
  • Barrel Nut Material: 7075-T6 Aluminum
  • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
  • Included Rail Sections: One Aluminum Picatinny Rail Section – 1 3/4” Length, 5 slots


  • 9″ Handguard – 9.9 oz
  • 12″ Handguard – 10.9oz
  • 15″ Handguard – 11.9oz

Actual Handguard Length

  • 9″ – 9.25″
  • 12″ – 12.0″
  • 15″ – 15.0″

Frequently Asked Questions:

Will this fit my AR-15?

The SPEAR is specially designed for use with our matching Billet Upper Receiver as well as 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. 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.

Want to see the SPEAR in action? Check out FreedomLover’s Review!

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 to assure you stay in the AR-15 barrel nut torque range while timing the barrel nut (30-60 ft lbs)

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.

Feature List

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Customer Reviews

Based on 622 reviews
Great handguard

Nice, sleek and super easy to install, can't go wrong with AT3 !!

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

Trevor Munson

Everything about your company is amazing. Answered my questions fast. Perfect packaging fast shipping Perfect fit love it.

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Great Product

Great finish and color, fits well, and made solid. I will purchase for many other rifles.

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Works, but not properly with VLTOR Clamp On Gas Block

I actually got this hand guard a while back and just getting around to using it, its my second one. This is the first time I tried to use a clamp-on gas block with it, and before I did I contacted AT3 and was told that my gas block selection - the VLTOR Clamp-On Low Profile Gas Block for AR-15 (.750) - would work with the hand guard.

Its a decent hand guard. But, if you use the VLTOR Clamp-On Low Profile Gas Block for AR-15 (.750), if the gas block is aligned vertical like its suppose to be the clamp screw heads are extremely close to the rail - I can slide a piece of paper in between the block clamp screw head and the rail and it slides though but its rubbing on both sides of the piece of paper and this is way too close. I'm attaching a pic to illustrate.

As you can see in the pic there is some light showing but the pic is slightly magnified for a better view - in reality that distance between the gas block clamp screw heads and the inner edge of the hand guard at that point measured 0.04 inches which is way too close.

So It you plan on using the VLTOR clamp on gas block you may need to go with another hand guard that's a little larger inner diameter.

Unfortunately, although this is a nice hand guard I'm locked into using the VLTOR clamp on gas blocks for my next few builds so I will not be purchasing any more of these hand guards.

I rate this a three because AT3 should have known this if they are going to tell people the VLTOR clamp on gas block works with their free float rail but basically makes it not free float at some point when heating and expansion and material flex is taken into account which is going to mean those clamp screws will be in firm contact with the rail at some point thus no longer a free float hand guard.

Jason Peterson

Love the look and feel of it. Planning on hitting the range soon

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