Geissele MK18 Super Modular Rail Free Float AR-15 Handguard – 16.5″ – M-LOK/Arca-Swiss

Be the first to review

SKU: 05-791S  |  UPC: 817953025154

Out of Stock

Join the waitlist to be emailed when this product becomes available

Orders will Ship within 1 Business Day
Geissele Lifetime Warranty!
TOP ADD-ON'S

Accu-Tac FD-4 ARCA Spec QD Bipod

$367.55
Geissele AR15 Reaction Rod - .223 / 5.56 NATO

Geissele AR-15 Reaction Rod – .223 / 5.56 NATO

$100.98

Build A Precision AR-15 with The MK18 Rail

The Geissele MK18 16.5″ Super Modular Rail is the ultimate long-length handguard for precision shooters, hunters, and professional users who want maximum rigidity, modularity, and compatibility with both M-LOK and Arca-Swiss mounting systems. Machined from 6061-T6 aluminum and finished with a Type III hardcoat anodizing, the MK18 features a full-length Arca-Swiss rail integrated along the bottom surface for seamless attachment to bipods, tripods, and other accessories. The MK18 is secured by Geissele’s 2.25” long barrel nut, and precision-machined interface ensures maximum rigidity and zero movement under recoil or hard use.

Features

  • Trusted by military professionals and elite shooters
  • Industry-leading rigidity and zero flex under pressure
  • Full-length integrated bottom ARCA Swiss rail for direct tripod and bipod mounting
  • Ideal for PRS, long-range AR builds, and varmint or precision shooting platforms
  • Modular, adaptable, and combat-tested
  • Made from 6061-T6 aluminum for strength and weight savings
  • Geissele’s 2.25” proprietary steel barrel nut and anti-rotation tabs for maximum lock-up and zero shift
  • Full-length Picatinny top rail for optics, lasers, and other accessories
  • Made in the USA and built to military-grade standards by Geissele

Specifications

  • Brand: Geissele
  • Model: MK18 16.5 Inch M-LOK/Arca-Swiss Super Modular Rail AR-15 Handguard
  • MPN: 05-791S
  • Fit: Mil-spec AR-15 Upper Receivers
  • Length: 10″
  • Handguard Rail: MLOK
  • Material: 6061-T6 aluminum
  • Finish: Type III Hardcoat Anodized
  • Colors: DDC (Desert Dirt Color)

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Geissele Limited Lifetime Warranty

  • Geissele Automatics warrants its firearms, components, and tools against defects in materials and workmanship during the lifetime of the product.
  • Geissele Automatics does not warrant against normal wear and tear, items consumed or expended by their normal use (including springs, pins, etc.), product misuse (including criminal misuse, negligence or use under the influence of drugs or alcohol), accidental damage, or damage caused by improper handling, unapproved modifications to the product, defective or improper ammunition, or corrosion.
  • Defective accessories (e.g., scopes, suppressors, flash hiders, sights, slings, parts with glass or electronic components, etc.) may be warranted by their original manufacturers but are not covered by this warranty.

If you submit a valid claim under this Limited Lifetime Warranty, Geissele Automatics will authorize your return of the product and, at its sole discretion, will:

  1. Repair the product, including replacement of defective parts with new or refurbished parts
  2. Replace the product with a product of equal or greater value.

If Geissele Automatics decides to replace a product under this warranty, Geissele will keep the product being replaced.

You must satisfy all terms and restrictions set forth in this Limited Lifetime Warranty and obtain a Return Material Authorization before shipping any product to Geissele Automatics.

Before shipping any product to Geissele Automatics, please ensure the following:

  1. The product has not been modified, is clean and any accessories have been removed (unless otherwise instructed by a Geissele Automatics technical support agent)
  2. There is no ammunition in any product or packaging
  3. The completed Return Material Authorization form has been placed inside the packaging
  4. The Return Material Authorization number has been clearly written on the outside of the packaging.

Any failure to follow these instructions could result in your package being refused and returned to you without repairs at your expense.

To obtain service, contact Geissele Automatics at sales@geissele.com or 610-272-2060.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Leave your review
Rating

Customers who viewed this item also viewed these products

Geissele MK4 Federal M-LOK Super Modular Rail AR-15 Handguard

Geissele MK4 Federal Super Modular Free Float AR-15 Handguard -...

$382.50
Super Rigid Battle-Proven Design The Geissele MK4 Federal Super Modular Rail Handguard is a
Geissele Automatics MK4 Super Modular Rail - M-LOK Free Float Rail with Picatinny Rails - AT3 Tactical

Geissele Automatics MK4 Super Modular Rail Free Float AR-15 Handguard...

$306.00
Bomb-Proof M-LOK Handguard with Picatinny Rails for Ultra-Secure Mounting Barrel Nut Wrench not included!

Geissele MK16 Super Modular Free Float AR-15 Handguard - M-LOK...

$331.50
Geissele Super Modular MK16 AR15 Rail The Geissele Super Moduler MK16 Rail is one
Geissele Automatics MK8 Super Modular Rail - M-LOK Free Float Rail - AT3 Tactical

Geissele MK8 Super Modular Rail Free Float AR-15 Handguard -...

(1)
$280.50
Geissele’s Most Popular M-LOK Rail for the Duty-Grade AR15 Barrel Nut Wrench not included!
UTG PRO M-LOK Arca Rail

UTG PRO M-LOK Arca Rail

$29.97
UTG PRO M-LOK Arca Rail: Versatile Precision Mounting Solution The UTG PRO M-LOK Arca
Geissele Automatics MK14 Super Modular Rail - Slim M-LOK Free Float Rail - AT3 Tactical

Geissele MK14 AR-15 Super Modular Rail Free Float AR-15 Handguard...

$280.50
Lightweight, Slim-Line, and Built Tough by the Best in the Industry Barrel Nut Wrench
STNGR USA ARCA Bipod and Tripod M-LOK Rail Adapters - Multiple Sizes and Colors

STNGR M-LOK ARCA Bipod Rail Adapter

$25.99
STNGR Cerakote ARCA M-LOK Rails Get more out of your bipod or tripod with
Odin Works M-Lok to Arca Rail Bipod Mount

Odin Works M-Lok to Arca Rail Bipod Mount

$37.05
Mount Your Arca Compatible Tripod/Bipod With M-Lok To Arca Rail Mount The Odin Works
Armaspec M-LOK to ARCA Rail - Multiple Length Options

Armaspec M-LOK to ARCA Rail - Multiple Length Options

$32.39
Elevate Your Shooting Platform with Armaspec This clever Arca rail from Armaspec seamlessly integrates
M-LOK Handguard with Carbine Front Sight Cutout

UTG Pro Super Slim Drop-In AR-15 Handguard - 15 Inch...

(85)
$114.97
Full Length Drop-In Handguard for Carbine Length AR-15 This Super Slim drop-in handguard works

Geissele Super Duty MOD1 16 Inch 5.56mm Complete Assembled AR-15...

$1,285.20
Combat-Ready Geissele Engineering The Geissele Super Duty MOD1 16″ Complete Upper is a top-tier,
BCM AR-15 Gunfighter MCMR - .223/5.56mm M-LOK Compatible Modular Rail - 6 Sizes Available

BCM Gunfighter MCMR AR-15 Handguard - .223/5.56mm M-LOK Modular Rail...

(3)
$206.95
The MCMR Series Handguards are Powerfully Built and Lightweight for a More Secure Hold
AT3 Flatline AR-15 Rifle

AT3™ AT-15 FLATLINE Rifle 16 Inch 5.56 NATO - 15...

(1)
$1,099.99
AT3 Tactical FLATLINE 5.56 Rifle – the AR You Wanted the First Time The
UTG PRO AK Super Slim M-LOK Handguard

UTG PRO AK Super Slim M-LOK Handguard

$99.97
American-Made AK Super Slim: UTG PRO’s M-LOK Handguard Revolution Transform your AK with this
UTG Pro AR-15 M-LOK Free Float Handguard - Super Slim

UTG Pro Super Slim Free Float AR-15 15" Handguard -...

(7)
$134.97
Super Lightweight Handguard with a Grooved Surface for a Solid yet Comfortable Grip for

Questions & Answers

Don't see the answer
you're looking for?

Loading questions...