Geissele Automatics Super Modular Rail MK8 9.30" M-LOK, Desert Dirt Aluminum for AR Platform, Barrel Nut Included (05284S)

The Geissele Automatics Super Modular Rail MK8 9.30" M-LOK is a free-float handguard built for AR platform shooters who demand accuracy and modularity without compromise. This aluminum rail brings together Geissele's engineering reputation with Magpul's proven M-LOK mounting system, giving you a rigid, straight platform that maintains zero repeatability through disassembly and reassembly—critical when you're chasing precision at the range or in the field.

What sets the MK8 apart is its combination of strength and weight efficiency. The design uses vented geometry at the lower 45-degree quadrants to shed heat fast and keep overall weight down to 10.3 ounces with hardware. The M-LOK slots run at the 3, 6, and 9 o'clock positions plus the upper 45-degree quadrants, giving you genuine flexibility to mount lights, lasers, grips, and other accessories exactly where you need them. Unlike some rails that force you into a standard setup, the MK8 adapts to your vision.

The included barrel nut is a 2.25" Geissele design that increases contact surface where the rail meets your receiver, establishing a platform you can trust to stay true. That longer interface is why this rail earns its reputation for accuracy and stability across multiple range sessions. Installation requires a Geissele barrel nut wrench (sold separately); this isn't a universal fit, but the extra precision is the payoff.

At 9.30 inches, the MK8 strikes a balance between coverage and sight radius, suiting modern AR builds from mid-length to mid-range duty setups. The Desert Dirt finish is durable and subdued, letting your optics and accessories be the focus.

Key Features

• M-LOK mounting at 3, 6, 9 o'clock and upper 45-degree quadrants for true modularity
• Vented design reduces weight while maximizing heat dissipation
• Proprietary 2.25" Geissele barrel nut included for increased receiver interface and zero repeatability
• Free-float design supports precision shooting and accuracy
• Lightweight at 10.3 oz with all hardware
• Desert Dirt aluminum finish

Specifications

Frequently Asked Questions

What's included with this handguard?

The MK8 ships with Geissele's proprietary 2.25" barrel nut. You'll need a Geissele barrel nut wrench (sold separately) to install it, but the nut itself is included.

Will this rail work on my AR-15?

Yes, the Super Modular Rail MK8 is designed for AR platform rifles, including standard AR-15s. Verify your upper receiver is compatible with a free-float rail design before purchase.

What makes the M-LOK system better for mounting accessories?

M-LOK slots on the 3, 6, and 9 o'clock positions plus the upper 45-degree quadrants give you flexibility to place lights, grips, and other gear where they work best for your shooting style, rather than being locked into fixed mounting points.

Does this rail stay accurate after multiple disassemblies?

The 2.25" Geissele barrel nut creates a larger contact surface with your receiver than standard nuts. This design is engineered to maintain zero repeatability and keep the rail straight and true through repeated field maintenance and reassembly.