The YHM Diamond Series 9.2-Inch Midlength Forearm (brand part no. YHM-9633-DX) is a distinctive AR-15 handguard built for a midlength gas system, sized to 9.290 inches. Its diamond-shaped heat vents are more than a styling choice, opening the forearm up for better heat dissipation than round or slotted vent patterns while cutting weight. An extended top rail gives you gap-free installation against the upper receiver’s rail, and T-marked rail sections let you note accessory positions for repeatable remounting. The forearm and barrel nut are machined from 6061-T6 aluminum and hardcoated to military specifications, while the steel jam nut and anti-rotation screws are plated in a matching black finish. Yankee Hill Machine’s end caps and anti-rotation screws complete a secure, rattle-free installation.

Key Specifications

• Distinctive diamond-shaped heat vents for improved cooling.
• Sized for a midlength gas system at 9.2 inches.
• Extended top rail for gap-free installation against the upper receiver.
• T-marked rails to note and repeat accessory positions.
• Accepts YHM end caps for a finished look.
• Uses anti-rotation screws for a secure, rattle-free fit.
• Forearm and barrel nut machined from 6061-T6 aluminum.
• Hardcoated to military specifications for durability.
• Steel jam nut and anti-rotation screws plated to a matching black finish.
• Full-length Picatinny top rail for optic mounting.

Frequently Asked Questions

What gas system length is this forearm for? A midlength gas system, at 9.2 inches overall.

What material is it made from? 6061-T6 aluminum, hardcoated to military specifications.

What are the diamond vents for? Improved heat dissipation while keeping the forearm’s weight down.

Buy the YHM Diamond Series 9.2-Inch Midlength Forearm

Order the Yankee Hill Machine Diamond Series Forearm from our Lubbock, Texas gun shop and give your midlength build a distinctive, well-vented handguard. It is a direct-fit upgrade among our AR handguards. Add it to your cart for fast, insured shipping direct to your door.