MPN: 05-284B / 05-284S / 05-285B / 05-285S / 05-286B / 05-286S


  • One-piece free float design
  • Full top scalloped rails for optional attachments
  • Maximum venting at the lower 45° quadrants create maximum heat dissipation and weight reduction
  • Updated version of the proven Geissele Barrel Nut design for ease of installation and superior rigidity
  • M-LOK slots at 1, 3, 6, 9, and 11 o'clock positions
  • Compatible with most low-profile gas blocks
  • Quick disconnect sling socket at the 3 and 9 o’clock positions
  • Available in Black or Desert Dirt Color (DDC)


  • Material: 6061-T6 Aluminum
  • Finish: Type 3 Hardcoat Anodized
  • Length (When Installed): 9.3-Inch, 13.5-Inch, and 15-Inch
  • Weight (With Barrel Nut):
    • 9.3-Inch: 10.3 oz.
    • 13.5-Inch: 13.1 oz.
    • 15-Inch: 14.3 oz.
  • Inside Diameter: 1.35"
  • Outside Diameter:
    • Height: 2.3"
    • Width: 2.11"


  • Mil-Spec AR-15 uppers


  • 1x Geissele MK8 Super Modular M-LOK Handguard
  • 1x Barrel Nut
  • 1x Press Nut
  • 2x Mounting Screw Washers
  • 2x Socket Head Shoulder Screws
  • 2x Set Screws
  • 1x 5/64 Allen Wrench
  • 1x 4mm Allen Wrench

*Barrel nut wrench not included


The Geissele MK8 Super Modular M-LOK rail is designed as a fully modular rail that utilizes the Magpul M-LOK technology. The SMR MK8 is one of the first rails that gives the user true full-modular ability while still maintaining a robust and rigid rail system for the AR platform.

Enhanced Performance

The Geissele MK8 rail is a one-piece free-floating design with a fully scalloped top rail section for quick and easy attachments of accessories. The venting of the lower 45-degree quadrants allows for maximum heat dissipation while also offering significant weight reduction. There are M-LOK slots that provide areas for numerous accessories, such as laser sights and lights, located at the one, three, six, nine, and 11 o'clock positions. In addition, two quick disconnect sling sockets are placed at the three and nine o'clock positions.

Quality Construction

The Geissele MK8 Super Modular M-LOK rail is engineered from 6061-T6 aluminum and coated with a Type-3 hardcoat anodized finish in black or Desert Dirt. The rail is designed to keep your platform lightweight and maneuverable. The three optional lengths of the installed modular rail are 9.3, 13.5, and 15 inches and weigh in at 10.3 ounces, 13.1 ounces, and 14.3 ounces, respectively, including the barrel nut. The rail is 2.3 inches high and only 2.11 inches wide, so it won't get in your way.

Easy Installation

The Geissele MK8 rail is easy to install, requires no special gunsmithing knowledge, and has all the needed parts. The rail is compatible with all mil-spec AR-15 uppers and works with most low-profile gas block AR platforms.

*Due to the chemical process that takes place during Type 3 Hardcoat, the finish on the product can vary from one to the next, even if it is the same batch.

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