Foxtrot Mike Products Ultra Light Free Float M-LOK AR-15 Handguard - Primary Arms Exclusive - 8.5"

Manufactured by Foxtrot Mike Products
SKU: PA-5.56-8.5ULHG
MPN: PA-5.56-8.5ULHG
Manufactured by Foxtrot Mike Products
10 Reviews
$53.99 $69.00

In Stock

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This Foxtrot Mike Products Ultra Light Free Float Handguard is a Primary Arms Exclusive. It features a slim profile with M-LOK attachment points along the full 8.5” in length as well as on the diagonal angles allowing for more variety when attaching accessories. It is machined from 6061-T6 aluminum and has a type III hardcoat anodized finish for excellent corrosion resistance. This AR-15 free float handguard is compatible with all Mil-Spec upper receivers and most low-profile gas blocks, so you have the freedom to build your rifle the way that you want. It is easy to install with the included proprietary barrel nut and eight hardened steel screws to ensure that it won’t loosen over time. This M-LOK handguard also has a full length picatinny top rail that mounts flush with M4 flat top upper receivers to give you more mounting space for scopes, red dots and iron sights. If you are looking to upgrade your current SBR, pistol, or build a new one, you can’t go wrong with this Primary Arms Exclusive FM products AR-15 handguard.

  • M-LOK compatible on all seven sides for lights, grips, bipods, and other accessories
  • Single piece free float design that is lightweight and durable
  • Machined from 6061-T6 aluminum
  • Mil-Spec hardcoat anodized black
  • Light and slim profile for increased ergonomics and comfort
  • Includes proprietary barrel nut
  • Full length picatinny top rail
  • Barrel nut requires 1 3/16 wrench (30 MM)
  • Made in the U.S.A.

Feature rich, high-quality, and affordable, Foxtrot Mike Products offer cutting edge solutions utilizing the highest quality materials and manufacturing processes available.
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Accessory AttachmentM-LOK
BrandFoxtrot Mike Products
FinishHardcoat Anodized
Gas System LengthPistol
Handguard Length8.5
MaterialAluminum - 6061-T6
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

Ratings & Reviews

10 reviews


Budget handguard

by -

Good quality hardware. Looks and fits great! Takes 1 3/16" wrench.

Not bad


Not bad for a budget handguard. The finish is nice. I Installed this over a 8.5” barrel. My only complaint is that it didn’t come with shims. I had to shim the barrel nut to get timing right


by -

I wondered why the barrel nut was packaged outside the handguard, it’s because it doesn’t fit inside it even with a hammer.

Overall good for a budget build

by -

This is a decent handguard for the price. I did have to lightly file the inside edges that slide over the barrel nut due to heavy finish on both parts that would not mate together(not visible after installed). shims are required for timing and proper torque spec of the barrel nut.

Great for the price.

by -

It is super light and solid. Be sure to have some barrel shims on hand to get timing correct. Also, it did not want to slide on to the barrel nut so I needed to do some buffing with the dremel to smooth things out so it would slide on. I still give it 5 stars because when installed it's good and the price is great. Just be ready to spend a little extra time with the install.

Decent for the money...

by -

For a low-cost freefloat handguard bargain build, these perform nicely.

I highly recommend using RED lock-tite thread locker on the 8 button head hex screws holding it to the barrel nut. Blue locktite when getting it hot during rapid fire, and the screws could back out. No problems with red locktite.

Great for the price!

by -

It is super light and solid. Be sure to have some barrel shims on hand to get timing correct. Good quality at a low cost. Looks and fits great!

Solid light weight rail

by -

This rail mounts on a steel barrel nut that must be timed but it is very solid. The barrel nut has flats cut on it that line up with the screws on the rail. The rail fits very tight on the barrel nut; I used some grease to help get it on and off for test fitting. I had to take it off a few times to get it perfectly lined up with the upper. Once I had the barrel nut timed like I wanted, I cleaned it up and used a little retaining compound to bed the rail to the nut. I wish it came with higher quality screws but, it is a very sturdy mounting solution and the rail isn't going anywhere.

Out of Spec

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I purchased this HG for 8.5" for this fun build. I got my muzzle device in and it was bottoming out. Checked with multiple measuring tools and all read 8.75" on the nose. Because of the .25" in accuracy I'm having to buy a new handguard. Was not expecting this from Foxtrot Mike, especially being .25" out of spec. Great fit and finish just not to proper spec.

Weak low quality Barrel Nut

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The quality of the barrel nut is way below par. I’ve built many AR platforms using various manufactures parts from the industry. This barrel nut is the lowest quality I’ve dealt with by far. When attempting to time the handguard using less than the recommended torque values the barrel nut just gave out. The barrel nut threads held up but the outside of the nut where you attach your wrench just bent and sprung out of shape. Torque wrench is in spec by the way. This has never happened before in 13 years of working on an AR with various barrel nuts. The handguard itself is nice quality the barrel nut needs to be addressed. Also not that I needed them but there were no included instructions so a first timer AR enthusiast would be left a little in the dark. Maybe the get what pay for price applied here, I just wanted a certain length for a certain build and suppressor combo.