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13.5" Super Modular Rail Handguard M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
15" Super Modular Rail MK-8 M-Lok
15" Super Modular Rail MK-8 M-Lok
MK 8 15" M-LOK Super Modular Rail, DDC
MK8 10.5" M-LOK Super Modular Rail Black
MK8 10.5" M-LOK Super Modular Rail Black
MK8 10.5" M-LOK Super Modular Rail DDC
MK8 10.5" M-LOK Super Modular Rail DDC
13.5" Super Modular Rail Handguard M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
9.3" Super Modualr Rail MK8 M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
13.5" Super Modular Rail Handguard M-LOK Black
15" Super Modular Rail MK-8 M-Lok
15" Super Modular Rail MK-8 M-Lok
MK 8 15" M-LOK Super Modular Rail, DDC
MK8 10.5" M-LOK Super Modular Rail Black
MK8 10.5" M-LOK Super Modular Rail Black
MK8 10.5" M-LOK Super Modular Rail DDC
MK8 10.5" M-LOK Super Modular Rail DDC
None
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GEISSELE AUTOMATICS LLC - MK8 10.5" M-LOK Super Modular Rail Black

8 Reviews
Color
Item Length (Inches)
MK8 10.5" M-LOK Super Modular Rail Black
Brownells #
100042898
MFR #
05-1657B
UPC
810081130073
$325.00
Coupon Code
Purchase Limit Help

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Specifications
Item Height (Inches):
2.200
Color:
Black
Item Length (Inches):
10.500
Finish:
Anodized
Material:
Aluminum
Item Weight (lbs):
0.700
Handguard Style:
M-LOK
Item Width (Inches):
1.900
Make Model Fit:
AR-15.Universal
Restriction
Restricted Part:
Yes
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International purchase information

What is the GEISSELE AUTOMATICS LLC - MK8 10.5" M-LOK Super Modular Rail Black?

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.

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AR-15/M16 MK 8 SUPER MODULAR RAILS, M-LOK REVIEWS

4.4
8 Reviews
5 Stars
63%
4 Stars
25%
3 Stars
0%
2 Stars
13%
1 Stars
0%
Reviews Summary
Overall, reviewers are impressed with the Geissele MK8 Super Modular Rail for its quality, lightweight design, and ease of installation. While many praise its performance and machining, some highlight issues like bulkiness, high price, and color discrepancies. A mix-up in orders also occurred for at least one customer, but satisfaction remains high.
What Reviewers Are Saying
Product Quality
80%
Reviewers consistently emphasize the superior build quality of the MK8 rail, noting its robust construction and excellent machining that contribute to a solid feel and reliable zero hold for attachments.
Design and Usability
50%
While many appreciate the lightweight nature and aesthetic of the rail, some users express concerns about its bulkiness, which may limit grip styles and versatility in handling, making it less adaptable for certain shooting techniques.
Installation Experience
60%
Installation is described as straightforward by several customers, highlighting user-friendly features. However, certain reviewers note the necessity to purchase additional tools, like the Geissele barrel nut wrench, as an inconvenience.
Customer Service and Order Issues
30%
There are mixed experiences regarding customer service, with one reviewer noting a mix-up in order fulfillment while expressing overall satisfaction. While this may have been an isolated incident, it reflects potential areas for improvement.
Pricing and Value
70%
The high price tag of the MK8 rail is acknowledged by several reviewers, who question its value. Nevertheless, many believe the quality justifies the cost, putting it in a competitive position among similar products in the market.
Color Discrepancy
20%
A few customers mention that the color of the rail appears slightly off in certain lighting conditions, described as purplish rather than a consistent black, suggesting that quality control in color consistency could be improved.
5
Light weight and durable
This holds zero for every attachment I’ve put on it. As well as being a great light weight option for my long range builds.
by HUNTER LYLE on July 02, 2025
Verified Purchase
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5
Great product
Great product! Very well made and it aligned perfectly with the picatinny rail on the top of my mil-spec receiver. I highly recommend it!
by Ray on August 02, 2021
Was this review helpful? 1
5
Good, but buy a barrel nut wrench
Good and sturdy rail, the extra rigidity helps a lot if you plan to run a sighted laser/IR system. If you haven't purchased one you will need to buy the Geissele barrel nut wrench to install it.
by Eric on October 22, 2019
Was this review helpful? 0
5
World-Class Rail
The only reason you shouldn't buy this? You'll want to buy another! Seriously, this is one ROCK SOLID rail with great machining and tight finishes. I've had LaRue, Troy, YHM, etc and the Geissele beats them all IMO. Installation is a breeze and the tolerances are super tight, but not so much that it hinders install. It looks sharp and locks up super tight. I have only two minor criticisms. One, it's expensive. But I am a free-market guy so really that's an observation rather than a criticism. When you factor in the gas block it's not a bad deal. Second, one of the handguard bolt heads was only lightly finished, so it's more sliver than black. I'm surprised that made it past QC on a $300 rail. Quick touch of flat black fixed that. Highly, highly recommend this rail. If you can stomach the cost you won't be sorry.
by Matt from TX on April 05, 2017
Was this review helpful? 1
5
Wonderful rail
I ordered a 13 Mk4 rail for a 16" mid-length upper. I received this 15" Mk8 instead. This was my first time experiencing anything other than perfect service from Brownells. I installed the Mk8 anyway, which fits very well with my Seekins billet upper. The 15" rail stops 1/4 shy of the base of my brake, so attaching a QD suppressor overtop should be fine. The space between the rail and receiver is, in less than technical terms, one tight-fitting piece of paper. The rail is of remarkable build quality and the rifle feels completely solid, I couldn't be happier with what Geissele is offering. The perfect combination of function and form. I especially like how the long barrel nut supports so much of the rail with very tight tolerance. For my shooting abilities, this results in a negligible shift of point of impact when using irons while the rifle is supported with a bipod at the end of the rail. Besides the product mix-up, I am very pleased with this Geissele rail.
by Tom on October 03, 2016
Was this review helpful? 2
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