Geissele Automatics MK4 Super Modular Rail Handguard 13.5 Inch M-LOK – Black (05-278B)

• Free float handguard designed for AR 15 platforms with extended modular mounting capability
• 13.5 inch length with M LOK slots at 3 6 9 and upper 45 positions
• Includes proprietary 2.25 inch barrel nut for stable and repeatable installation interface
• Integrated short picatinny rail sections at front allow additional accessory mounting options
• Maximum venting design reduces weight and improves heat dissipation during firing
• Black finish rail requires separate barrel nut wrench and excludes included gas block

The Geissele Automatics MK4 Super Modular Rail 13.5″ M-LOK Handguard is a handguard designed for mounting accessories on AR-15 platforms.

The Geissele Automatics MK4 Super Modular Rail 13.5″ M-LOK Handguard has a length of 13.5 inches, an outer diameter of 2.11 inches, and weighs 13.5 ounces with hardware. This product is used for attaching accessories using the M-LOK interface and integrated M1913 Picatinny sections at the 3, 6, and 9 o’clock positions. It includes a barrel nut but requires a separate Geissele barrel nut wrench for installation. The rail features venting for heat dissipation and a 2.25-inch barrel nut interface for increased surface contact with the receiver. In standard configurations, this free float handguard provides a rigid mounting platform for AR-15 rifle builds.