Midwest Industries G4M Gen 4 AR-15 M-LOK Aluminum Handguard - Black

The Midwest Industries G4M Gen 4 AR-15 M-LOK handguard is a USA-made aluminum rail system built to give you modular mounting flexibility without adding unnecessary weight or bulk. If you're running a modern AR platform and want to add optics, lights, grips, or other tactical accessories without permanent modifications, this handguard delivers the mounting real estate and durability hunters, precision shooters, and tactical enthusiasts depend on. The Gen 4 design refines what made earlier Midwest Industries handguards trusted in the field—solid American construction, thoughtful ergonomics, and the kind of reliability that survives a decade of use.

Built from 6061 aluminum and finished with hardcoat anodize, the G4M handles rough conditions and regular use without degrading. The barrel nut and torque plate are heat-treated 4140 steel, engineered to hold zero under the stress of repeated shooting and equipment changes. Every edge is dehorned and deburred, so your hands stay comfortable during long shooting sessions or hunting days. Seven sides of M-LOK slots run along the handguard, plus a full-length Picatinny rail across the top—that's serious mounting flexibility for lights, lasers, bipods, rail covers, and other gear without forcing you into a single configuration.

Available in five lengths—10.5", 12.625", 13.375", 14", and 15"—there's a G4M that works for SBR builds, patrol-length uppers, or longer precision platforms. All lengths include five integral anti-rotation quick-detach sling pockets, so you can run a sling exactly how you want it. Midwest Industries backs the G4M with a lifetime warranty, a guarantee they stand behind the American craftsmanship baked into every unit.

Key Features

• Six sides of M-LOK mounting slots plus continuous top Picatinny rail for modular accessory attachment
• 6061 aluminum construction with hardcoat anodize finish for corrosion resistance and durability
• Heat-treated 4140 steel barrel nut and torque plate for strength and zero retention
• Full dehorn and deburred edges for comfort during shooting and handling
• Five integral anti-rotation QD sling pockets for fast sling deployment
• Five length options to match SBR, midlength, and rifle-length uppers
• 100% USA manufactured
• Lifetime warranty

Specifications

Frequently Asked Questions

What length AR-15 handguard do I need?

Midwest Industries offers the G4M in five lengths. The 10.5" works for short-barreled rifles, 12.625" and 13.375" suit midlength to rifle-length gas systems, 14" is common for longer precision builds, and 15" extends nearly to the muzzle. Choose based on your barrel length and the amount of rail real estate you want for accessories.

Can I mount Picatinny accessories on the G4M?

Yes. The handguard includes a full-length Picatinny rail on top, plus seven sides of M-LOK slots, so you can run Picatinny-mounted lights, lasers, optic mounts, and other gear. M-LOK accessories also work on the side and bottom slots.

Does the G4M come with a barrel nut?

Yes, the barrel nut and torque plate are included and are heat-treated 4140 steel for durability and zero stability.

Is the Midwest Industries G4M made in the USA?

Yes, the G4M is 100% USA manufactured, and Midwest Industries backs it with a lifetime warranty.