Expo Arms® M-LOK AR-15 Handguard - Black - 13"

Manufactured by Expo Arms
Manufactured by Expo Arms
28 Reviews

In Stock

Orders of non-FFL items will ship same day if ordered before 3:30pm CST (M-F). FFL orders will ship within 5 business days if transfer details are provided.

For individual Officer, First Responder, and Military pricing please make sure you are logged in. for details



The Expo Arms® Handguards are machined from high-quality 6061-T6 aluminum bar stock, allowing for a slim profile with plenty of M-LOK slots for attaching grips, lights, and other accessories. This is a free float handguard that comes with a 6061-T6 aluminum barrel nut and anti-rotation tabs for an extremely strong lock up that will hold tight on any Mil-Spec receiver. At 13” in length, this M-LOK handguard will run great on any 16” AR-15s and has plenty of internal diameter for compatibility with low profile gas blocks. This Expo Arms Handguard is great for a new build or simply upgrading an old AR. Get yours today only at Primary Arms.


  • Black Hardcoat Anodized
  • Full M-LOK Compatibility (7 sides)
  • Anti-Rotation Tabs
  • 6061 Aluminum Construction
  • 6061 Aluminum Barrel Nut
  • Slim Profile Design
  • Compatible with all MIL-SPEC upper receivers
  • Weight: 10.8 ounces
See More


Accessory AttachmentM-LOK
BrandExpo Arms
FinishHardcoat Anodized
Gas System LengthExtended Rifle
Handguard Length13
Inner Diameter1.35 in
MaterialAluminum - 6061-T6
Weight10.8 oz.
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

28 reviews

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Surprisingly impressive rail

by -

I bought a couple of these rails for builds that I’m doing with my boys. I liked these because they were smaller diameter, have mlok everywhere, have a continuous top rail, and have anti rotation tabs.

What I didn’t expect was how impressed I’d be with the lockup system on the barrel nut. The key fits in a groove in the barrel nut and there is a screw that goes into the key that gets tighter into the barrel nut as you tighten it. There are 2 other screws on either side of that screw and what you end up with is a very rigid lockup system. It’s definitely a better mounting system than my Midwest Industries combat rail.


by -

I just put one of these rails on my build and it feels very solid, and locks up tight. My only complaint is that it doesn't come with a wrench that fits the barrel nut, and a standard armorers tool wont work on it. Other than that being a bit of a hassle I've very happy with the hand guard.


by -

Very well made. Good looking and easy to assemble. I will be buying another soon for my next build

Nice Rail

by -

It's a nice rail for the price. There are a few issues however. First off for whatever reason unlike other Expo rails it doesn't come with a barrel nut wrench. So unless you happen to have a 1 3/16 crowsfoot laying around plan on spending another $20+ to buy one. Secondly, and I'm not sure if this is the case with all uppers, the barrel nut has to be shimmed for the rail to be able to installed correctly. Props to Primary Arms though. I called and explained the issues and they sent me a pack of Aero shims (of which I used all 8 to get it correctly installed, and a $25 gift certificate which covered the price of the barrel nut wrench I had to buy. I would recommend having barrel nut shims before you install this rail in case you need them.

High Quality


This is quite the handguard. I was able to pick one up for 20% off and I consider it a steal. Great finish and it's nice and lightweight. Very solid lockup to an aero m4 upper. The provided barrel nut is lightweight. No sharp edges anywhere. Why spend 2-4 times more when this handguard is available? No, you're not a tier 1 operator.

Best budget handguard

by -

Love it. Simple, excellent finish and sturdy.

Best that I have found for under $100


I have built 8 AR15 platform weapons and I needed a hand guard that was as close to 14” as I could get. Expo had the closest so I ordered the 13.5” version and it looks great. I could not be happier with the way it feels and how solid the connection between the hand guard and the barrel nut is. No timing issues getting the gas tube lined up either. Very easy install. I highly recommend this model hand guard!

Took a chance, will definitely buy again

by -

Quality product for a reasonable price. Matched perfectly with an Aero Precision upper (wish I could attach a picture to show). Barrel nut went on fine and easily torqued with a 1-3/16" crowsfoot wrench.

Pleasantly surprised

by -

Excellent fit and finish. Matched perfectly with an Aero Precision Upper and the attachment system to the barrel nut is secure and easy to align. I used a 1 3/16 crowfoot to torque the barrel nut.

Good solid product

by -

This is the second one of this series I've purchased. Decided to swap it with it's little brother (9-1/2") because it would look better on the 16" carbine. Having only to undo three screws and the lock nut to swap out made it nice and easy. The 9-1/2" will be used for a different project.

Being this was on sale, that made it even better and truthfully, the carbine looks better this this handguard. I would not hesitate to purchase again and recommend it to anyone who is considering Expo Arms handguards.