Aero 9.1 Mod 4 Handguard Kb

The Aero Precision 9.1 Mod 4 Handguard brings practical design and solid engineering to your AR-15 or M4 build. At 9.1 inches, this mid-length handguard strikes a clean balance between sight radius and hand placement, making it a natural fit for hunters, precision shooters, and builders who value both function and weight consciousness. Machined from 6061-T6 aluminum and finished in Kodiak Brown, it delivers durability without unnecessary heft—at just 5.27 ounces, every gram counts when you're carrying your rifle into the field or to the range.

Built for mil-spec AR-15 and M4E1 upper receivers, the Mod 4 uses an M-LOK mounting system that's become the standard for modern rifle accessory placement. The eliminated center-top rail keeps weight low while the indexed grooves at the 12 o'clock position give your grip a consistent, positive reference point. Quick-disconnect sling mounts at 3, 6, and 9 o'clock mean you can run your sling setup however makes sense for your mission. The 1.3-inch inside diameter accommodates low-profile gas blocks without fuss, and the 1.5-inch outer diameter keeps the profile lean.

If you're building around Aero's own M4E1 Upper Receiver or PRO Series components, the Mod 4 handguard drops in seamlessly—both in fit and aesthetics. It's the kind of upgrade that doesn't demand attention; it just works. Whether you're assembling a hunting rifle, a 3-gun build, or a precision AR, this handguard gets out of your way and lets you focus on shooting.

Key Features

• M-LOK attachment system for lightweight rail placement and accessory versatility
• Eliminated center-top rail reduces weight without sacrificing functionality
• Indexing grooves at 12 o'clock for consistent grip control
• Quick-disconnect sling mounts at 3, 6, and 9 o'clock positions
• Compatible with low-profile gas blocks
• Kodiak Brown anodized finish for corrosion resistance and stealth
• Machined 6061-T6 aluminum for strength and durability

Specifications

Frequently Asked Questions

Will this handguard fit my AR-15?

Yes, the Mod 4 is compatible with mil-spec AR-15 upper receivers and barrels. It also pairs directly with Aero Precision's M4E1 Upper Receivers. The 1.3-inch inside diameter fits standard barrel profiles and accommodates low-profile gas blocks.

What's included with the handguard?

You get the 9.1 Mod 4 Handguard itself finished in Kodiak Brown, with the M-LOK attachment system integrated. Be sure to torque the handguard screws to 55 ± 5 in-lbs during installation.

How much does it weigh?

The Mod 4 weighs 5.27 ounces, keeping your setup light without compromising rigidity or function.

Can I use this with a low-profile gas block?

Yes. The 1.3-inch inside diameter is specifically designed to accommodate low-profile gas blocks without interference.