Geissele Automatics Super Modular Rail MK14 9.30" M-LOK, Black Aluminum for AR Platform with Barrel Nut

The Geissele Automatics Super Modular Rail MK14 9.30" M-LOK handguard is a precision AR-15 rail system built for shooters who demand real estate for accessories without sacrificing a slim, ergonomic profile. Whether you're running rail covers, vertical grips, and a thumb-over-bore grip, or mounting optics and lights for duty or competition, the MK14 delivers the modularity serious AR builders expect from Geissele's combat-proven design. It ships with Geissele's proprietary free-float barrel nut—engineered to anchor your barrel straight and rigid for accuracy—and is machined from 6061 T6 aluminum with Type III hardcoat anodizing for durability in the field.

The MK14's layout prioritizes both function and mounting flexibility. A continuous Picatinny rail runs the full length of the top for your primary optic or backup sights, while M-LOK slots line the 3, 6, and 9 o'clock positions along the handguard's length, so you can position accessories exactly where you need them. Geissele also engineered QD pushbutton sling swivel sockets at the 1 and 11 o'clock positions at the rear—a thoughtful touch that keeps your setup clean and sling-ready without jury-rigging attachment points.

The slim cross-section is no accident. Geissele designed the MK14 to complement modern support-hand technique: the narrower profile lets shooters run their thumb naturally over the bore while keeping plenty of room for grip furniture and hand position. The 2.25" barrel nut provides substantial surface area for a secure, repeatable fit that won't shift zero during heavy use. Available in matte black, this is a no-frills, purpose-built rail for hunters, precision rifle competitors, and tactical shooters who value accuracy and accessibility over aesthetics.

Key Features

• 9.30" length with slim cross-section for ergonomic support-hand positioning
• M-LOK slots at 3, 6, and 9 o'clock positions along full length for flexible accessory mounting
• Full-length continuous Picatinny rail on top for optics and sights
• QD pushbutton sling swivel sockets at 1 and 11 o'clock (rear)
• Proprietary free-float barrel nut included (2.25" long) for rigid barrel anchoring
• 6061 T6 aluminum construction with Type III hardcoat anodize finish
• Purpose-built for AR-15 platform rifles

Specifications

Frequently Asked Questions

What's included with the MK14 handguard?

The MK14 ships with Geissele's proprietary free-float barrel nut. A barrel nut wrench is not included with current production units, and a gas block is not included.

Is this handguard compatible with my AR-15?

Yes, the MK14 is designed for AR-15 platform rifles and uses Geissele's proprietary barrel nut for installation. You'll need to be comfortable with, or have assistance with, barrel nut installation and torque specifications.

Can I use this handguard with a vertical grip and rail covers?

Absolutely. The slim cross-section of the MK14 was engineered specifically for shooters who pair vertical grips and rail covers with a thumb-over-bore support-hand grasp. The M-LOK slots run the full length at 3, 6, and 9 o'clock, giving you plenty of options for mounting furniture and accessories.

Does the MK14 work with quick-detach slings?

Yes. The handguard includes QD pushbutton sling swivel sockets at the 1 and 11 o'clock positions at the rear, so you can attach standard QD sling hardware without additional adapters.