Midwest Industries Free Float AR-15 Handguard M-LOK - Slim Line - 15"

Manufactured by Midwest Industries
Manufactured by Midwest Industries
9 Reviews

In Stock

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Freefloat, M-LOK compatible handguards are the name of the game in the AR-15 world. Whether you are building a new rifle or simply upgrading an old one, changing your handguard can do many things like increasing accuracy, reducing weight, and adding customization options for lights, lasers, and optics. This Midwest Industries Slim Line rail does all three. With the free float design, the rail does not exert pressure on the end of the barrel like traditional two-piece rail systems allowing for better accuracy from your barrel. Because it only has a single rail on the top of the handguard, it eliminates unnecessary weight while also making it much more comfortable to hold. Even though there is less rails, the M-LOK attachment system allows you to quickly attach rail sections in only the positions that are needed so you can put accessories exactly where you want them, increasing ergonomics. This free float handguard comes with all the necessary hardware to secure it to your AR-15 and features a rounded profile that feels more slim and ergonomic in your hand.

  • 6061 aluminum type 3 hard coat anodized
  • Continuous MIL-STD 1913 picatinny top rail
  • 4140 heat treated barrel nut and torque plate
  • Three sides of M-LOK
  • Includes 5-slot polymer M-LOK rail
  • Includes barrel nut and barrel nut wrench
  • Includes two integral anti-rotation QD sling swivels
  • Overall length: 15”
  • Installed weight: 11.6 ounce
  • Outside diameter: 1.5”
  • Inside diameter: 1.3”
  • 100% made in U.S.A. with Midwest Industries lifetime warranty

The MI Slim Line rail is compatible with all Mil-Spec forged upper receivers as well as the Midwest Industries Billet upper receiver. It features a slim design for increased ergonomics while also allowing room for gas blocks to fit underneath. However, it is not compatible with Piston AR gas systems. The included barrel nut is made from durable 4140 steel and is properly heat treated to withstand the high heat and pressure of the 5.56 caliber round. The handguard is designed to slip over the barrel nut without the need to screw it on like older designs. This allows it to be flush fit to the upper receiver and keeps the handguard from backing off over time.

Midwest Industries is a quality manufacturer of tactical weapons accessories. They produce handguards, rails, and iron sights for many of the most popular weapon platforms like the AR-15, .308, Sig MCX, AK-47, and many more. Their goal is to manufacture the highest quality parts at affordable prices backed by a lifetime guarantee.
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Accessory AttachmentM-LOK
BrandMidwest Industries
FinishHardcoat Anodized
Gas System LengthExtended Rifle
Handguard Length15
Inner Diameter1.3 in.
MaterialAluminum - 6061
Weight11.6 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

9 reviews

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Great and high quality!!

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If you’re struggling to find a nice M-LOK rail make sure to give this one a try, it fits tight, its not loose and quality feels top notch. It doesn’t feel all cheap like some other brands, you’re really getting your moneys worth. I put a few rounds through my AR and the only down side is that since its slim you will feel the heat closer to your hands from the barrel but thats it. I highly recommend this rail, Midwest Industries doesn’t disappoint! Buy it!

Good slim rail

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Good rail for the price. No need for barrel shims and the barrel nut wrench is included. Nice feel with mlok slots. I’ll definitely purchase again for future builds.

Does what you expect, great rail.

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It's meticulously finished, rigid, comfortable and stays cool under heavy fire. The QD mount is a great bonus. Very satisfied.

Very nice handguard

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I have this handguard on three on my builds now, and I really like how nice and slim it feels, how light it it, how nice it looks with the angled fore-end, and how nice the quality of the handguard is. However, it will not fit on some billet uppers because of the alignment tabs. The tabs keep this handguard straight and tight on a mil-spec upper, but they would not fit over my Juggernaut Tactical upper. Even so, I like this handguard enough that I might get another one and grind off enough of the tabs for it to fit on my billet upper.

Midwest industries free float handguard

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I had an older rifle and yes it was a carbine, I always wanted to have a different front sight never did like the A frame sight and gas block. My grandson said all can be changed out I just needed to order a new handguard and a new gas block, I personally never knew what I was doing but I ordered this, It took me longer to tear down the old barrel nut which was put on factory 15 years ago with no grease and ended up at the gunsmith to pull it off, $20 I proceeded to look at the directions and followed them and this thing went together with ease and thank God it came with a new barrel nut and a wrench, I would say this was the look I always wanted on this weapon and the price was great, mounting was easy, just make sure you grease your barrel nut when you put it on and your good to go, I definitely would recommend this handguard it is sweet you just need a low profile gas block

Slim and light

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Install was a little rough as the handguard was a press fit to the barrel nut. But once lined up and tightened I'm glad I made the change and wish I had bought this a long time ago. I wear a large cadet golf glove, so with my stubby hands this slim guard makes gripping the gun more comfortable. I will buy another for my next build or upgrade.

Couldn't Be Any Easier

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First... the slim line hand guard is exactly that. Slim, and light weight, (I puchased 2 in the 15" configuration). Exactly what I was looking for. Installation instructions were simple to follow. The provided barrel nut wrench worked well. All that is needed is a click type torque wrench for the barrel nut... and a click type screwdriver (and hex bits) to properly clamp the handguard in place.

A very simple, straight forward installation

Pretty darn good

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Nice and light, feels great in a c clamp. The barrel nut is a bit short so you get some flex in the handguard but it's not crazy. Mine would have been considered a blem by some other top tier companies it had a couple of scuffs and scratches so if that matters to you give it a good once over when you get it. But all and all it's pretty solid. They are also one of the companies that gives you everything you need. You don't have to buy a barrel nut wrench. I'm looking at you Geissele. This one comes with a polymer m lock rail. Yeah it's not load bearing but still it's included. And lastly the install is about as straightforward as you can get. I just put it on a regular Mill spec upper and probably the easiest rail I've ever installed.

Pretty solid


Got this for an SPR build. It is super light, feels pretty rigid. Mine was a little rough cosmetically coming out of the package. I think the one I got would be considered a blem by a lot of other manufacturers standards. So if that's something that bothers you or you care about, you're going to want to check it. As with every Midwest industry's product i've ever owned, they come with everything you need. Super easy to install. They even give you a little piece pic rail, sure, it's polymer but they still include it.