Geissele MK4 M-LOK Super Modular Rail | Up to 15% Off 4.7 Star Rating w/ Free Shipping

Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super M-Lok Modular Rail, 10.5in, Black, 05-1656B

Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super M-Lok Modular Rail, 10.5in, DDC, 05-1656S

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Rail MK4 M-LOK, 15in, Black, 05-315B

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Desert Dirt 05-278S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, DDC, 05-315S

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super Federal M-Lok Modular Rail, 10in, Black, 05-430B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super Federal M-Lok Modular Rail, 10in, DDC, 05-430S

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super M-Lok 10.5in Modular Rail, Black, 05-1656B

Geissele Mk4 M-Lok Super Modular Rail

Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super M-Lok 10.5in Modular Rail, DDC, 05-1656S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, Black, 05-315B

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, Black, 05-315B

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, Black, 05-315B

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Desert Dirt 05-278S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, DDC, 05-315S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, DDC, 05-315S

Geissele Mk4 M-Lok Super Modular Rail

Geissele 15in Super Modular Rail MK4 M-LOK, DDC, 05-315S

Geissele Super Modular Rail MK4 M-LOK, 15in, DDC, 05-315S

Geissele 15in Super Modular Rail MK4 M-LOK, DDC, 05-315S

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super Federal M-Lok 10in Modular Rail, Black, 05-430B

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super Federal M-Lok 10in Modular Rail, DDC, 05-430S

Geissele Mk4 M-Lok Super Modular Rail

Geissele MK4 Super Federal M-Lok 10in Modular Rail, DDC, 05-430S

Geissele Mk4 M-Lok Super Modular Rail

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black 05-278B

Government Export Restriction

This item may be regulated for export by the U.S. Department of State or the U.S. Department of Commerce. Please see our Export Policy prior to placing your order.

Documents

Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black, 05-278B

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Questions & Answers

Customer Reviews

Helpful Positive Review

Geissele MK4 by T, Verified Owner, April 29, 2021

Nice handguard if you can get OpticsPlanet to send all of the parts with it. You can buy this directly from Geissele for the same price. When I received mine it didn’t ship with the barrel nut or screws.

3/3 found this helpful

Helpful Positive Review

QUALITY!!! by CCCitizen, Verified Owner, October 22, 2020

This is a no nonsense quality built rail!!! I would reccomend this for any pistol/sbr build !! The machining fit and finish is just top notch!! Has all the rail space you need for anything you want mounted and gives your firearm a serious business lo...
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1/1 found this helpful

Helpful Positive Review

Most beautiful machining I've ever seen on a rail. by Joe, March 27, 2020

This rail has the most complex and smooth machining I've seen. It's far beyond anything I've had (BCM, Noveske NSR, DD, etc.). Light and VERY strong, Geissele is my go to for rails now (Radian is my go to for CH now).

1/1 found this helpful

Helpful Negative Review

Good handguard but bad qc by Bobby, February 24, 2020

I have purchased geissele products for the past 7 years and have always been happy with them. Ordered this hand guard with same expectations of quality that i have come to expect from geissele in the past. Upon inspecting the hand guard i noticed som...
Read More...

3/6 found this helpful

Most Recent Reviews

mk 4 rail rocks. by Rob, Verified Owner, May 26, 2026

My favorite Geissele rail. Don't forget to buy a barrel wrench as they're not included!

Most Recent Reviews

High quality rail. by Kevin, Verified Owner, March 31, 2026

Very happy with this rail, easy to install (just don't forget to purchase the not included barrel nut wrench!), great features. Steel Sling QD's, integrated MLOK and Picatinny sections, etc.

Read All 13 Reviews

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Made in USA

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.

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Product Info for Geissele MK4 M-LOK Super Modular Rail

Upgrading your AR Handguards & Forends lets you customize your weapon so that it performs, looks, and feels exactly how you want it to. One of the best upgrades you can make is by investing in a Geissele Super Modular Handguard Rail MK4. Featuring M-LOK attachment ports and integrated Picatinny rails at the fore end in the 3, 6, and 9 o'clock positions, you can put tons of attachments and optics on these handguards. Plus, it is designed with maximum venting in mind to reduce heat buildup and reduce the overall weight of the handguard, making maneuvering around tight areas easier and less cumbersome.

The Super Modular Rail even has Geissele's proprietary 2.25-inch long barrel nut that increases surface contact between the rail and receiver. This creates a steady, durable platform that you can trust to stay straight and true through long periods of regular, heavy use. Grab the Geissele Super Modular Handguard Rail today to take your weapon to the next level.

WARNING: California`s Proposition 65

Specifications for Geissele MK4 M-LOK Super Modular Rail:

Manufacturer:	Geissele
Gun Make:	AR Platform
Gun Model:	AR-15
Gun Rail:	Picatinny
Included Accessories:	Standard
Inner Diameter:	1.35 in
Outer Diameter:	2.11 in
Mount Type:	M-LOK
Country of Origin:	USA
Quantity:	1

Features of Geissele MK4 M-LOK Super Modular Rail

M-LOK and Picatinny Attachment Systems
Free-Float Design
Proprietary Barrel Nut
Lightweight, Super Modular Design

Package Contents:

Geissele MK4 M-LOK Super Modular Rail

NOTE: IF THIS IS YOUR FIRST TIME PURCHASING A GEISSELE AUTOMATICS RAIL, YOU WILL NEED TO PURCHASE A BARREL NUT WRENCH IN ORDER TO PROPERLY INSTALL THE RAIL.

The Geissele MK4 M-LOK Super Modular Rail is a quality addition to the Geissele lineup. For more great deals on AR Handguards & Forends by Geissele, please browse our Geissele Gun Parts page.

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Geissele MK4 M-LOK Super Modular Rail Orderable Models

List of Orderable Models

Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B , MPN: 05-283B , UPC: 854014005694 , Code: 1TO-HZ-05-283B-05-283B
Geissele MK4 Super M-Lok Modular Rail, 10.5in, Black, 05-1656B , MPN: 05-1656B , UPC: 810081130097 , Code: 1TO-HZ-05-283B-05-1656B
Geissele 9.3in Super Modular Rail MK4 M-LOK, AR-15, DDC, 05-283S , MPN: 05-283S , UPC: 854014005700 , Code: 1TO-HZ-05-283B-05-283S
Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, Black, 05-278B , MPN: 05-278B , UPC: 854014005717 , Code: 1TO-HZ-05-283B-05-278B
Geissele MK4 Super M-Lok Modular Rail, 10.5in, DDC, 05-1656S , MPN: 05-1656S , UPC: 810081130080 , Code: 1TO-HZ-05-283B-05-1656S
Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, DDC, 05-278S , MPN: 05-278S , UPC: 854014005724 , Code: 1TO-HZ-05-283B-05-278S
DEMO, Geissele Super Modular Handguard Rail, M-LOK, MK4, 13.5in, DDC, 05-278S , MPN: 05-278S-DEMO , Code: 1TO-HZ-05-283B-05-278S-DEMO-OB-A
Geissele MK4 Super Federal M-Lok Modular Rail, 10in, DDC, 05-430S , MPN: 05-430S , UPC: 817953027912 , Code: 1TO-HZ-05-283B-05-430S
Geissele Super Modular Rail MK4 M-LOK, 15in, DDC, 05-315S , MPN: 05-315S , UPC: 854014005748 , Code: 1TO-HZ-05-283B-05-315S
Geissele MK4 Super Federal M-Lok Modular Rail, 10in, Black, 05-430B , MPN: 05-430B , UPC: 817953027905 , Code: 1TO-HZ-05-283B-05-430B
Geissele Super Modular Rail MK4 M-LOK, 15in, Black, 05-315B , MPN: 05-315B , UPC: 854014005731 , Code: 1TO-HZ-05-283B-05-315B

Geissele MK4 M-LOK Super Modular Rail Unavailable & Discontinued Models

List of Unorderable Models

Open Box, Dealer Demo, Geissele Super Modular Handguard Rail, M-LOK, MK4, 9.3in, Black, 05-283B , MPN: 05-283B-DMO , Code: 1TO-HZ-05-283B-DMO
DEMO, Geissele MK4 Super M-Lok Modular Rail, 10.5in, Black, 05-1656B , MPN: 05-1656B-DEMO , Code: 1TO-HZ-05-283B-05-1656B-DEMO-OB-A

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Geissele MK4 M-LOK Super Modular Rail Up to 15% Off — Free 2 Day Shipping w/ code 2DAYAIR — 11 models

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Made in USA

Product Info for Geissele MK4 M-LOK Super Modular Rail

Specifications for Geissele MK4 M-LOK Super Modular Rail:

Features of Geissele MK4 M-LOK Super Modular Rail

Package Contents:

Geissele MK4 M-LOK Super Modular Rail Orderable Models

List of Orderable Models

Geissele MK4 M-LOK Super Modular Rail Unavailable & Discontinued Models

List of Unorderable Models

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More Deals

Geissele MK4 M-LOK Super Modular Rail Up to 15% Off — Free 2 Day Shipping w/ code 2DAYAIR — 11 models

Free Express Shipping!

Made in USA

Product Info for Geissele MK4 M-LOK Super Modular Rail

Specifications for Geissele MK4 M-LOK Super Modular Rail:

Features of Geissele MK4 M-LOK Super Modular Rail

Package Contents:

Geissele MK4 M-LOK Super Modular Rail Orderable Models

List of Orderable Models

Geissele MK4 M-LOK Super Modular Rail Unavailable & Discontinued Models

List of Unorderable Models