Geissele MK4 Federal Super Modular Free Float AR-15 Handguard - 10" - M-LOK - 2 Colors Available
or 4 interest-free payments of $100.00 with 
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Geissele Lifetime Warranty! what it covers
Product description
Super Rigid Battle-Proven Design
The Geissele MK4 Federal Super Modular Rail Handguard is a duty-grade rail system designed for reliability, modularity, and strength in the most demanding environments. What makes the MK4 unique is the integration of Picatinny rails at the 3′, 6′, 9′, and 12′ positions at the end of the handguard. Based on the same rail adopted by U.S. Special Operations and Federal Agencies, the MK4 Federal offers a solid mounting platform for optics, lights, grips, lasers, and other mission-critical accessories. The proprietary 2.25” long barrel nut and precision-machined interface ensure maximum rigidity and zero movement under recoil or hard use. When you’re building a combat-ready carbine, the MK4 delivers unmatched strength, stability, and modular versatility.
Features
- Trusted by military professionals and elite shooters
- Industry-leading rigidity and zero flex under pressure
- Picatinny rails at the 3′, 6′, 9′, and 12′ positions at the end of the handguard
- 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: MK4 Federal M-LOK Super Modular Rail AR-15 Handguard
- MPN: 05-430S, 05-430B
- Fit: Mil-spec AR-15 Upper Receivers
- Length: 10″
- Handguard Rail: MLOK
- Material: 6061-T6 aluminum
- Finish: Type III Hardcoat Anodized
- Colors: Black and Desert Dirt Color (DDC)
All 2 options on this page
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Questions & Answers
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Warranty & returns
Geissele Lifetime Warranty!
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:
- Repair the product, including replacement of defective parts with new or refurbished parts
- 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:
- The product has not been modified, is clean and any accessories have been removed (unless otherwise instructed by a Geissele Automatics technical support agent)
- There is no ammunition in any product or packaging
- The completed Return Material Authorization form has been placed inside the packaging
- 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.
90-day no-hassle returns
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.
