--- title: "Geissele Automatics Desert Dirt 13.5\" M-LOK Rail" description: "13.5\" Desert Dirt M-LOK rail with integrated 3, 6, and 9 o'clock Picatinny sections, upper 45-degree M-LOK slots, and included barrel nut." canonical_url: "https://www.kygunco.com/product/geissele-mk4-super-modular-rail-13.5-m-lok-desert-dirt" meta: author: KYGUNCO "og:description": "13.5\" Desert Dirt M-LOK rail with integrated 3, 6, and 9 o'clock Picatinny sections, upper 45-degree M-LOK slots, and included barrel nut." "og:image": "https://cdn.kygunco.com/assets/products/256268/thumbnail.jpg?v=1718631142" "og:image:height": "500" "og:image:width": "500" "og:title": "Geissele Automatics Desert Dirt 13.5\" M-LOK Rail" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Gun Parts](https://www.kygunco.com/category/shooting/gun-parts) / [Handgun & Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts) / [Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts) / [Stocks & Recoil Pads](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/stocks-and-recoil-pads) / GSS-05-278S ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/256268/main.jpg?v=1718631142) For illustration purposes only, this image may not be an exact representation of the product. # GEISSELE MK4 Super Modular Rail 13.5" M-LOK Desert Dirt The Geissele SMR MK4 is a 13.5" Desert Dirt free-float M-LOK handguard with integrated short Picatinny rail sections at the fore in the 3, 6, and 9 o'clock positions. M-LOK slots extend along the 3, 6, and 9 o'clock positions and upper 45-degree quadrants. It includes a proprietary 2.25" barrel nut; the required wrench is sold separately. See Price In Cart ** 5 interest-free payments of **$61.73** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) Pay over time with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Flat Rate $13.94 for every 25 lbs. Shipping to HI & AK may incur additional fees. ** Ships To Your Home Fulfilled by a partner warehouse. ** Partner Fulfilled Selling fast. Limited quantities available. Item # 256268 Style GSS-05-278S UPC 854014005724 Condition New Manufacturer [Geissele Automatics](https://www.kygunco.com/brand/geissele) Weight 1 lb The Super Modular Rail (SMR) MK4 M-LOK is Geissele's ultra-lightweight M-LOK handguard option. These rails are purpose-built and feature integrated short 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. It utilizes 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. Requires a Geissele barrel nut wrench for installation (sold separately). - Height: 2.4" - Inner Diameter: 1.35" - Outer Diameter: 2.11" - Weight w/ Hardware: 13.5oz. - Length 13.5" - Includes Barrel Nut (Barrel Nut Wrench Sold Separately) - Geissele Automatics AR-15 13.5" Super Modular Rail MK4 M-LOK Shop with KYGUNCO for the best selection, competitive pricing, and exceptional customer service. Experience the difference that comes with buying from a trusted outdoor retailer with over 20 years of experience in the industry. ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from Geissele Automatics ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/geissele-mk4-super-modular-rail-13.5-m-lok-desert-dirt#webpage","@type":"WebPage","description":"13.5\" Desert Dirt M-LOK rail with integrated 3, 6, and 9 o'clock Picatinny sections, upper 45-degree M-LOK slots, and included barrel nut.","name":"Geissele Automatics Desert Dirt 13.5\" M-LOK 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