Description
The Midwest Industries 13.5" HK416/MR556 handguard is a straight upgrade over the factory unit, and it swaps out the heavy, rail-covered stock guard for something lighter and easier to live with. It runs 13.5 inches long, tips the scale at about 14 ounces with the cross bolt, and installs as a direct replacement that retains your factory barrel nut. If you have wrestled with the weight and heat of the original HK setup, this is one of the more popular fixes out there.
Why the HK416 M-LOK Handguard Earns Its Keep
Midwest builds this rail from 6061 aluminum with a mil-spec hard coat anodized finish, so it holds up to real use while shaving mass off the front end. The slimmer profile is easier to grip than the chunky factory guard, and cutting away all those unused picatinny surfaces means less heat transfer to your support hand during long strings. There is a mil-spec top rail for your sights or optics, plus a heat treated 4140 cross bolt with a phosphate finish holding everything in place.
Mounting Options on the MR556 Handguard
Seven sides of M-LOK compatible slots give you a lot of real estate for accessories. Run a light and pressure switch, add a hand stop or vertical grip, mount QD sling points, or keep it clean and minimal. It ships with one M-LOK compatible rail section so you can start adding gear right out of the box. It's a smart layout for anyone building out a defensive, range, or duty-style setup on an HK416 or MR556.
Installation is refreshingly simple for an HK platform, and the whole thing is made in the USA and backed by a lifetime warranty. Fit runs on the snug side, which most folks consider a good sign since it means no wobble once it's seated. This 13.5-inch length looks and balances well on a 16-inch barrel.
Key Specifications
- Manufacturer: Midwest Industries
- MPN: MI-HK416M13.5
- UPC: 816537019947
- Model: HK416 / MR556
- Length: 13.5 inches
- Weight: 14 ounces with cross bolt (M-LOK rail adds .5 oz)
- Material: 6061 Aluminum
- Finish: Mil-Spec Hard Coat Anodized
- Cross Bolt: Heat Treated 4140, Phosphate Finished
- Mounting Style: M-LOK
- Top Rail: Mil-Spec Picatinny
- Color: Black
- Installation: Drop-In, retains factory barrel nut
- Origin: Made in the USA
- Warranty: Lifetime
What’s Included
- 13.5" HK416/MR556 M-LOK handguard
- Heat treated 4140 cross bolt
- One M-LOK compatible rail section
Frequently Asked Questions
Will this Midwest Industries handguard fit my HK416 and MR556?
Yes, this 13.5-inch handguard is a direct drop-in replacement designed for the HK416 and MR556 platforms. It retains your factory barrel nut, so you don't need to swap that out. Keep in mind it is not compatible with a 416 chambered in .22LR, since those use a proprietary handguard.
Can I run a suppressor under the HK416 M-LOK handguard?
No, this rail is not built with suppressor clearance in mind. Midwest does not offer a silencer-compatible version for the HK416, so a can will not fit underneath. If you want a suppressed setup, you'll need to look at a different rail designed for that clearance.
How does the weight compare to the factory HK handguard?
This one is a solid weight savings over the stock unit at roughly 14 ounces with the cross bolt. Ditching the heavy factory picatinny rails also trims mass and helps the front end run cooler, since there is less metal soaking up barrel heat. Many owners pick it up specifically to lighten and slim down a nose-heavy HK build.
Does the MR556 handguard come with any M-LOK rail sections?
It ships with one M-LOK compatible rail section, so you can bolt on a light, grip, or other accessory right away. With seven sides of M-LOK slots, you have plenty of room to expand as your setup grows. Additional rail sections and M-LOK accessories are easy to add later.





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