The Yankee Hill Machine Black Diamond M-LOK Forearm in rifle length (Yankee Hill Machine part no. YHM5343DX) is a free-floating AR-15 handguard built for shooters who want a slim, lightweight rail without giving up mounting versatility. Yankee Hill Machine has manufactured AR-15 components for decades, and the Black Diamond series uses a free-float design that keeps the barrel isolated from handguard pressure for consistent accuracy. Machined from aluminum, the forearm keeps weight down at 12.3 oz while adding a T-marked extended Picatinny top rail for optics and iron sights. M-LOK slots at the 3, 6, and 9 o’clock positions let shooters mount lights, grips, and slings exactly where needed, and the kit includes the barrel nut and wrench required for installation.

Key Specifications

• Measures 12.6″ in overall length, suited to rifle-length gas systems.
• Weighs just 12.3 oz for a slim, lightweight handguard.
• Built with a free-floating design to keep the barrel isolated from handguard pressure.
• Constructed from aluminum for a durable yet lightweight build.
• Top rail is a T-marked extended Picatinny rail for optics or iron sight mounting.
• Offers M-LOK slots at the 3, 6, and 9 o’clock positions for flexible accessory placement.
• Includes the barrel nut and wrench needed for a complete installation.

Frequently Asked Questions

Is this handguard free-floating? Yes, it is a free-float design that isolates the barrel from handguard pressure for consistent accuracy.

Does it come with installation hardware? Yes, the barrel nut and wrench needed for installation are included with the handguard.

Where are the M-LOK slots located? M-LOK slots run along the 3, 6, and 9 o’clock positions, leaving the top rail clear for optics.

Buy the Yankee Hill Black Diamond M-LOK Handguard

Upgrade a rifle-length AR-15 build with a slim, free-floating handguard built for real use. Order this Yankee Hill Machine handguard from our AR handguards selection, with fast, insured shipping from our Lubbock, Texas gun shop.