Midwest Industries 9.25" Slim Line M-LOK HandGuard, Black Anodized Aluminum, Fits AR Rifles, Includes 5-Slot Polymer Rail (MI-SLH9.25)

The Midwest Industries 9.25" Slim Line M-LOK HandGuard brings a lightweight, modular platform to your AR rifle build without sacrificing durability or mounting versatility. If you're running a mid-length or carbine setup and want a slim profile that doesn't eat up real estate on your rail, this handguard delivers a clean, functional design that lets you attach optics, lights, and other gear exactly where you need them. The three-sided M-LOK slots give you flexibility for custom configurations, while the Picatinny rail up top keeps your scope and backup sights secure and properly indexed.

Built from 6061 aluminum with Type 3 hard-coat anodizing, this handguard is tough enough for duty use and field conditions while staying light in your hands. Midwest Industries engineered the barrel nut with their patented 4140 heat-treated torque plate—the same steel treatment you'll find in quality bolt carriers—so you're getting industrial-grade hardware under the handguard, not stamped commodity metal. The slim 1.5" outer diameter keeps things compact and minimizes snag points when moving through brush or tight spaces. Everything is fully dehorned and deburred, which means no sharp edges to catch on your gear or hands during handling and installation.

The package includes the handguard, the heat-treated barrel nut, a 5-slot polymer M-LOK rail for immediate modularity, QD sling sockets built into both sides, and an installation wrench. The whole rig is made in the USA. This is a solid platform if you want to keep your AR lean and clean while maintaining all the mounting flexibility M-LOK offers.

Key Features

• Three-sided M-LOK slots for modular accessory mounting
• MIL-STD 1913 Picatinny rail on top for optics and iron sights
• Patented 4140 heat-treated torque plate for secure, reliable installation
• Super-slim 1.5" outside diameter—minimal profile, maximum maneuverability
• Type 3 hard-coat anodized 6061 aluminum for durability and corrosion resistance
• Integral QD sling sockets on both sides
• Fully dehorned and deburred edges
• Includes 5-slot polymer M-LOK rail for immediate accessory capability
• Heat-treated barrel nut and installation wrench included
• Made in the USA

Specifications

Frequently Asked Questions

Will this handguard fit my AR-15?

Yes, the Midwest Industries 9.25" Slim Line HandGuard fits AR rifles. Confirm your upper receiver and barrel nut are standard AR dimensions before installing.

What's included in the box?

You get the handguard, a heat-treated 4140 barrel nut with the patented torque plate, a 5-slot polymer M-LOK rail, and an installation wrench. No gunsmithing tools beyond the included wrench are needed for most installations.

Can I mount a light, laser, or vertical grip to this handguard?

Yes. The three-sided M-LOK slots accept any M-LOK-compatible accessory—lights, lasers, grips, rail segments, and bipods all work. The included 5-slot polymer rail can be attached to any M-LOK section for additional mounting points. The top Picatinny rail accepts standard Picatinny-mounted optics and backup sights.

How slim is the 1.5" outer diameter compared to other handguards?

At 1.5" OD, the Slim Line is designed for a compact profile that reduces snag points and keeps your rifle balanced and nimble. It's narrower than many combat-oriented handguards, making it popular for hunting, precision work, and setups where you want a clean, uncluttered profile.