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Geissele MK4 AR-15 Super Modular Rail - 15" DDC

AR-15 Handguard

Out of stock

Geissele MK4 Super Modular Rail - 15" DDC


The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-lightweight M-LOK option. These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o’clock positions. Maximum venting for heat dissipation also dramatically reduces the rail's overall weight, while maintaining its same strong and rigid platform. Utilizing Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45 quadrants. The SMR MK4 is both versatile and modular, allowing the user to tailor their platform to his or her unique needs.


The SMR MK4 also features Geissele's proprietary 2.25" long barrel nut. This increases the surface contact where the rail interfaces with the receiver and creates a platform that can be trusted to be straight and true the entire length of the free float rail. This increases accuracy and zero repeatability during disassembly and reassembly when performing maintenance.



  • Height: 2.4"
  • Color: DDC
  • Material: 6061-T6
  • Finish: Type 3 Hardcoat Anodize
  • Inner Diameter: 1.35"
  • Outer Diameter(DAQ*): 2.11"
  • Weight: 12.8oz (15.1oz w/ barrel nut)


NOTE: Geissele's rails are designed to work with Mil-Spec M4 upper receivers. The compatibility with billet receiver sets is unknown.

More Information
SKU 05-315S
Product Type AR-15 Handguard
Manufacturer Geissele
Color Desert Dirt
Rail Length 15"
Mount M-LOK
Option AR-15
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