Geissele 10.5" Super Modular Rail MK4 - M-LOK Black - 05-1656B

Upgrade your AR-15 platform with the Geissele 10.5″ Super Modular Rail MK4 M-LOK in Black, a premium free-float handguard engineered for serious shooters who demand lightweight performance without sacrificing durability or modularity. This rail delivers exceptional strength and precision, making it an ideal choice for tactical applications, competition, or custom builds where every ounce and attachment point matters.

Key Features

• Ultra-lightweight construction using 7000 Series Aluminum with extensive venting to dissipate heat quickly while reducing overall mass, allowing for faster handling and reduced fatigue during extended use.
• Integrated M-LOK system at the 3, 6, and 9 o’clock positions plus upper 45° quadrants, providing versatile mounting options for lights, grips, bipods, and other accessories without adding unnecessary bulk.
• Built-in Picatinny sections at the forward end in key positions for immediate attachment of iron sights or optics, enhancing compatibility and setup flexibility.
• Proprietary 2.25″ barrel nut that maximizes surface contact with the receiver for a rock-solid, straight interface that maintains zero repeatability even after repeated disassembly.

Specifications

• Length: 10.5 inches
• Material: 7000 Series Aluminum with Type III Hardcoat Anodize finish
• Inner Diameter: 1.35 inches
• Outer Diameter (DAQ): 2.11 inches
• Height: 2.4 inches
• Weight: 10.6 oz (12.74 oz with barrel nut)
• Profile: Free Float
• Compatibility: Designed for Mil-Spec M4 upper receivers

Why Choose the Geissele Super Modular Rail MK4

Traditional handguards often add excess weight or limit accessory placement, compromising your rifle’s balance and customization potential. The MK4 MK4 M-LOK solves these issues with strategic venting and precise M-LOK placement that keeps your setup light yet rigid. Its extended barrel nut design ensures a true, reliable platform that supports consistent accuracy, while the black hardcoat anodize finish provides superior corrosion resistance in demanding environments.

Whether you’re building a lightweight carbine or optimizing an existing AR-15 for modularity, this rail offers the perfect balance of strength, weight savings, and attachment versatility to meet professional standards.

Benefits for the Shooter

• Improved maneuverability and quicker target acquisition thanks to reduced weight and optimal balance.
• Enhanced heat management during rapid fire sequences.
• Greater customization freedom for mission-specific configurations.
• Long-term reliability with repeatable zero retention after maintenance.

Experience the Geissele difference in quality and engineering—equip your rifle with a handguard built to perform under pressure.