Skip to main content

Sign In / Enroll

Get rewarded!


Sign In / Enroll

Get rewarded!

A woman outside with a dog
A woman outside with a dog

Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum

Shop all Geissele Automatics
Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum

Item # 6121533

Geissele Automatics Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum
Geissele Automatics Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum
$325.99
Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum

Item # 6121533

Geissele Automatics Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum
Geissele Automatics Geissele Automatics Super Modular MK4 Rail for AR-15, 9.30 in., M-LOK, Barrel Nut Included, Desert Dirt, Aluminum
$325.99

The Super Modular Rail (SMR) MK4 M-LOK is Geisseles ultra-rugged 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.

  • Geissele Super Modular Rail (SMR) MK4 M-LOK is their ultra-rugged M-LOK rail option.
  • Purpose-built design with integrated M1913 picatinny rail sections at the 3, 6, and 9 o'clock positions (fore of the rail).
  • Provides maximum venting for heat dissipation.
  • Venting also dramatically reduces overall rail weight while maintaining a strong, rigid platform.
  • Uses Magpul M-LOK technology at the 3, 6, and 9 o'clock positions, plus the upper 45 quadrants.
  • Modular and versatile, allowing the user to tailor the platform to individual needs.
  • Features Geissele's proprietary 2.25" long barrel nut.
  • The 2.25" barrel nut increases surface contact between the rail and receiver.
  • Designed to keep the free-float rail straight and true along its entire length.
  • Helps improve accuracy and zero repeatability after disassembly and reassembly for maintenance.
  • Firearm Fitment: AR-15
  • Color: Desert Dirt Anodized
  • Diameter: 2.11" Outer
  • Finish: Anodized
  • Firearm Type: AR Platform
  • Free Floating: Yes
  • Includes: Barrel Nut
  • Length: 9.30"
  • Material: Aluminum
  • Style: M-LOK
  • Weight: 9.30 oz