The Geissele Automatics MK4 Super Modular Rail (Geissele part number 05-283B) is a purpose-built, 9.5-inch M-Lok handguard for the AR-15 platform, finished in black aluminum. It features integrated M1913 Picatinny rail sections at the fore of the handguard in the 3, 6, and 9 o’clock positions, giving shooters short Picatinny real estate for lights, lasers, or sling mounts without covering the entire rail in rail sections. Geissele’s proprietary 2-inch barrel nut secures the handguard to the upper receiver with the same attention to rigidity found across the Super Modular Rail line.

Key Specifications

• Length is 9.5 inches.
• Attachment is M-Lok, with integrated Picatinny sections at the 3, 6, and 9 o’clock positions.
• Uses Geissele’s proprietary 2-inch barrel nut.
• Built specifically for the AR-15 platform.
• Finish is black aluminum.

Frequently Asked Questions

Does this handguard have any Picatinny rail sections? Yes, it has integrated M1913 Picatinny sections at the fore of the rail in the 3, 6, and 9 o’clock positions.

What barrel nut does this handguard use? It uses Geissele’s proprietary 2-inch barrel nut.

What platform is this handguard built for? It is built specifically for the AR-15 platform.

Buy the Geissele Super Modular Rail MK4

Get short Picatinny sections exactly where you need them without covering the whole rail. Geissele’s MK4 keeps the M-Lok versatility while adding built-in mounting points at 3, 6, and 9 o’clock. Browse our full AR handguard selection and order from our Lubbock, Texas gun shop for fast, direct shipping.