Geissele Automatics MK4 Super Modular Rail Handguard 15 Inch M-LOK – Black (05-315B)

• Free float handguard designed for AR 15 rifles with extended modular accessory mounting
• 15 inch length with M LOK slots at 3 6 9 and upper 45 degree positions
• Includes proprietary 2.25 inch barrel nut for stable and repeatable mounting
• Integrated short picatinny rails allow mounting of optics, lights, or accessories
• Maximum venting reduces overall weight and enhances heat dissipation during firing
• Black finish rail requires separate barrel nut wrench and does not include gas block

The Geissele Automatics MK4 Super Modular Rail Handguard 15″ is a rail handguard designed for mounting accessories on AR-15 platform rifles. This Geissele Automatics MK4 Super Modular Rail Handguard 15″ uses an M-LOK interface with integrated Picatinny rail sections and a 15-inch free-float length. It includes a proprietary 2.25-inch barrel nut and weighs approximately 15.1 ounces with hardware.

The Geissele Automatics MK4 Super Modular Rail Handguard 15″ is built as a modular handguard system with M-LOK attachment points at the 3, 6, and 9 o’clock positions and upper 45-degree quadrants. It features venting for heat dissipation, a 2.4-inch height, 1.35-inch inner diameter, and 2.11-inch outer diameter. This product is used for mounting optics, grips, and accessories on rifle platforms. In standard configurations, the rail provides multiple attachment positions and a continuous top alignment surface. The MK4 handguard includes a barrel nut and requires a compatible wrench sold separately, and it is categorized under handguards and forends for rifle setups.