The Geissele Automatics MK14 Super Modular Rail (Geissele part number 05-578B) is a 9.3-inch M-Lok handguard built with a smaller diameter and lower overall height for a slimmer package on AR-platform builds. It ships with an updated version of Geissele’s proven barrel nut, a 2.25-inch design whose long surface contact with the receiver keeps the free-float rail straight and true along its entire length while also easing installation. Machined from 6061-T6 aluminum for strength without excess weight, it places M-Lok slots at the 3, 6, and 9 o’clock positions so shooters can mount lights, bipods, and other accessories securely, and the whole rail is finished in a durable Type III hardcoat anodizing.

Key Specifications

• Length is 9.3 inches.
• Attachment slots are M-Lok, placed at the 3, 6, and 9 o’clock positions.
• Construction is 6061-T6 aluminum, precision machined.
• Includes an updated 2.25-inch Geissele barrel nut for rigidity and easier installation.
• The design uses a smaller diameter and lower overall height for a slimmer package.
• Finish is Type III hardcoat anodized for durability.
• A barrel nut is included with the handguard.

Frequently Asked Questions

Does this handguard include a barrel nut? Yes, it includes an updated 2.25-inch Geissele barrel nut.

What accessory mounting system does this handguard use? It uses M-Lok slots placed at the 3, 6, and 9 o’clock positions.

What is this handguard made from? It is precision machined from 6061-T6 aluminum and finished in Type III hardcoat anodizing.

Buy the Geissele Super Modular Rail MK14

Get a slimmer, more rigid handguard without sacrificing M-Lok real estate. Geissele’s MK14 barrel nut design keeps the free-float rail straight and true along its full length. Browse our full AR handguard selection and order from our Lubbock, Texas gun shop for fast, direct shipping.