MPN: 05-573B / 05-573S / 05-575B / 05-575S / 05-578B / 05-578S


  • One-piece free float design
  • Full top Picatinny rail for optional attachments
  • Smaller diameter and overall height to create a slimmer package
  • Updated version of the proven Geissele Barrel Nut design for ease of installation and superior rigidity
  • M-LOK slots at 3, 6, and 9 o'clock positions
  • Compatible with most low-profile gas blocks
  • Quick disconnect sling socket at the 11 and 1 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: 12.84 oz.
    • 15-Inch: 13.4 oz.
  • Inside Diameter: 1.27"
  • Outside Diameter:
    • Height: 2.02"
    • Width: 1.54"


  • Mil-Spec AR-15 uppers


  • 1x Geissele MK14 Super Modular M-LOK Handguard
  • 1x Barrel Nut
  • 1x Press Nut MK13
  • 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


When considering a rail system for your AR-type rifle's upper receiver, fit and finish are paramount. Loose barrel nuts, crusty powder coats, and creaky plastics don't exactly boost an owner's confidence in their weapon. That's why shooters choose Geissele for rock-solid, precision-engineered M-LOK systems.

"We Manufacture Confidence"

It might be a corporate motto, but when you pick up a rifle with a Geissele MK14 rail, you'll know it isn't mere boilerplate. Manufacturing standards for Geiselle's products are so demanding that each barrel nut must be hand-selected to fit each rail, granting your rifle a rigidity and strength you can feel. When it comes to attaching accessories and stomping through rough country that sense of solidity is important.

Feel the Balance

Geissele's reputation for precision manufacturing isn't hidden away in specs and numbers, it's visible to the naked eye. The M-LOK connection points at the 3, 6, and 9 o'clock positions and quick-disconnect sling attachments bring your rifle into the 21st century, while the durable anodized finish promises years of hard work in the field. The Geissele MK14 rail offers an excellent balance of weight reduction and ruggedness.

*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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  • This Item: Geissele MK14 Super Modular M-LOK Rail
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