Super Modular Rail MK8 M-LOK

Super Modular Rail MK8 M-LOK

Super Modular Rail MK8 M-LOK

Regular Price: $225.00

Sale Price $191.25

MK8 Height:


Available Lengths: 

 7"  •   9.5"  •  13"  •  15"

MK8 ID*:




Installed Weight
(w/ Hardware):

7” MK8 Rail - 8.9oz
9.5” MK8 Rail - 10.6oz
13”  MK8 Rail - 13.3oz
15” MK8 Rail - 14.7oz 

ID* - Inner Diameter
OD* - Outer Diameter
DAQ* - Distance Across Quadrants

Available in Black and DDC

.750" Low Profile Stainless Steel Geissele Super Gas Block Included

Click Here to review our DDC (Desert Dirt Color) disclaimer before purchasing.

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


Item Number:



In stock

* Required Fields

Regular Price: $225.00

Sale Price $191.25

Super Modular Rail MK8 M-LOK

Full Description

The Super Modular Rail (SMR) MK8 M-LOK™ is Geissele’s ultra-modular model. The SMR MK8 is one of the first rails available to utilize the Magpul M-LOK technology. These rails are designed to give the user full modularity while maintaining a strong and rigid platform. Maximum venting at the lower 45° quadrants create maximum heat dissipation and also dramatically reduces the rail's overall weight. Utilizing Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45° quadrants. The SMR MK8 is both versatile and modular, allowing the user to tailor their platform to his or her unique needs. 

The SMR MK8 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. 

Bundled with a low-profile Geissele Super Gas Block, a $59 value, the SMR MK8 is not only feature packed, but it is also value packed.

Additional Information

Weapon Platform AR15/M4/M16

Super Modular Rail MK8 M-LOK

Reviews (5)

overall rating 5.0

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Best on the Market - Tyler

As is the usual with Geissele products, whatever they make is the best on the market. Lightweight, strong, stiff (for maintaining zero for lasers/sights on the rail), attractive, offset mounting options, and no more expensive than the competitions' rails (when factoring in the gas block).

I've got one 13" and one 9.5" installed on carbines. If you're on the fence, just do it.

One thing I will say, I would like to see the rails offered without the gas block, for those who already have a gas block, or must use a different gas block for various reasons.

October 30th, 2017

Robust and solid equipment. - David

First Geissele rail I've used, absolutely amazing. The barrel nut design is extremely easy to install. The rail firs snuggly into place. A robust and rigid design that is ergonomic and lightweight. A definite must for the modern AR series of rifles. Could not be happier with my purchase. Had it on my rifle for over five months at the time of this review, still an amazing and robust piece of equipment!

August 28th, 2017

Another excellent product. - Todd

The rail came with every tool needed to install it, as well as a gas block. This is on of, if not the most solid handguards I have used. It drips quality from every pore, is light, and feels wonderful in the hand. Shooting my AR is even more enjoyable and satisfying because of my MK8.

June 13th, 2017

Amazed with the mk8 rail and their customer service! - Zachary

I recently purchased the MK8 13" DDC rail and plan on many more purchases in the future. The rail arrived two days after my purchase, it looks incredible! This rail is perfect, it's strong, light weight, and a breeze to install. During my install I lost a gas block set screw. I contacted Geissele to either buy some more or for a p/n so I could order more else where. Geissele's amazing customer service sent a new set of screws free of charge! I've never been more impressed by a company's product and customer service. Thanks Geissele

June 5th, 2017

Perfection - JP

If your looking for a sleek, sturdy, modular, and great looking rail you have found it. I have the DDC 13" and it's perfect. Easy to install and remove for maintenance on barrel/ Gas block. It comes with a beast of a gas block which once pinned is bomb proof as well as the rail. Great combo. Plus the swag pack is A1 on top of my steak! Much appreciated Geissele.

May 17th, 2017
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