The Geissele 13.5" Super Modular MK8 M-LOK handguard is a free-float AR-15 rail system built for shooters who demand both precision and customization. Geissele's modular approach lets you configure your platform exactly how you want it—whether you're setting up a long-range precision rifle, a competition gun, or a tactical carbine. The MK8 uses Magpul's M-LOK mounting standard at the 3, 6, and 9 o'clock positions as well as the upper 45-degree quadrants, giving you flexible attachment points for lights, grips, bipods, and other accessories without the weight penalty of full Picatinny rail coverage.

One of the standout features is the engineering at the lower 45-degree quadrants—aggressive ventilation there keeps weight down and lets heat dissipate quickly if you're running suppressed or pushing rounds downrange fast. The 13.5-inch length strikes a balance for mid-length builds, offering plenty of rail real estate while keeping your overall package handy. Geissele's proprietary 2.25-inch barrel nut significantly increases the contact surface between the handguard and receiver, which translates to a rigid platform that stays straight and true shot after shot. That matters if you care about zero repeatability between disassembly and maintenance—your scope return to zero when you reassemble.

Installation requires a Geissele barrel nut wrench (sold separately). The rail comes with the barrel nut included, so you're not buying additional hardware, just the tool needed to do the job right. At 13.1 ounces with hardware, this is a serious piece of gear that won't bloat your rifle's weight budget.

Key Features

• M-LOK modular mounting at 3, 6, and 9 o'clock plus upper 45-degree quadrants for flexible accessory attachment
• Free-float design with Geissele's extended 2.25-inch barrel nut for maximum rigidity and accuracy
• Aggressively vented lower quadrants reduce weight and improve heat dissipation
• Comes with barrel nut; maintains zero repeatability through disassembly and reassembly

Specifications

Length	13.5 inches
Height	2.3 inches
Inner Diameter	1.35 inches
Outer Diameter	2.11 inches
Weight with Hardware	13.1 oz
Mounting Standard	Magpul M-LOK
Includes	Barrel nut
Requires	Geissele barrel nut wrench (sold separately)

Frequently Asked Questions

What AR-15 platforms is this handguard compatible with?

The Geissele 13.5" MK8 is designed as a free-float AR-15 rail system. It mounts using Geissele's proprietary barrel nut and is compatible with standard AR-15 receivers.

Do I need any special tools to install this handguard?

Yes. Installation requires a Geissele barrel nut wrench, which is sold separately. The barrel nut itself is included with the handguard.

What's included in the box?

The handguard comes with the barrel nut. The barrel nut wrench required for installation is sold separately.

How much does the MK8 weigh?

The 13.5" MK8 weighs 13.1 ounces with all hardware included.