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Customer Reviews
Most Recent Reviews
phenomenal by wcr347, Verified Owner, November 7, 2025
Great fitmeng and design just wish they provided the barrel nut tool.
Most Recent Reviews
The Good Stuff by Hydro, Verified Owner, October 3, 2025
This is my second Geissele MK4 rail, first new one. I thought I would save the money and get a cheaper handguard. It just wasn't the same as the Geissele. The MK4 is just better in feel and fit for me. I do wish it would come in a 12 inch version, as...
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Most Recent Reviews
Geissele MK4 Super M-Lok Rail by Mark, Verified Owner, August 1, 2025
Fit & finish are great. Paired up well with my blem upper that I got laying around.
Most Recent Reviews
geissele handguard by jay, Verified Owner, December 26, 2024
This geissele product comes highly recommended. If your not familiar with geissele, their products are rock solid and this handguard is no exception. Be sure to pick up a geissele barrel nut wrench. And this handguard install is a breeze. The price...
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Most Recent Reviews
mk4 rail is awesome!!! by Beowulf tactical, Verified Owner, December 18, 2024
Anything Geissele is good to go the name speaks for it self Optics planet just gets it to you for an amazing price and quick shipping BUY IT !
Most Recent Reviews
Best handguard I’ve bought by Phil, December 31, 2023
Optics planet got it to me quick and it’s by far the best handguard I’ve bought. I’ve used dd , bcm , MI , etc this is definitely my favorite so far
Read All 6 Reviews
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Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Geissele MK4 Super M-Lok 10.5in Modular Rail

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 oclock 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.image

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.

WARNING: California`s Proposition 65

Specifications for Geissele MK4 Super M-Lok 10.5in Modular Rail:

Manufacturer: Geissele
Finish: Type 3 Hard Coat Anodized
Fabric/Material: 7000-series aluminum
Gun Make: AR Platform
Gun Model: AR-15
Gun Type: Rifle
Handguard Length: 10.5 in
Handguard Type: Free-Float
Gun Rail: Picatinny
Weight: 10.6 oz
Inner Diameter: 1.35 in
Outer Diameter: 2.11 in
Height: 2.4 in
Mount Type: M-LOK
Country of Origin: USA

Package Contents:

  • Geissele MK4 Super M-Lok 10.5in Modular Rail

Geissele MK4 Super M-Lok 10.5in Modular Rail Orderable Models

List of Orderable Models

  • Geissele MK4 Super M-Lok 10.5in Modular Rail, Black, 05-1656B , MPN: 05-1656B , UPC: 810081130097 , Code: 1TO-HZ-MLNB4-05-1656B
  • Geissele MK4 Super M-Lok 10.5in Modular Rail, DDC, 05-1656S , MPN: 05-1656S , UPC: 810081130080 , Code: 1TO-HZ-MLNB4-05-1656S
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