Mk4 10" Federal Super Modular Rail M-LOK Gray

Name: Mk4 10" Federal Super Modular Rail M-LOK Gray
Brand: Geissele Automatics
Availability: OutOfStock

Geissele Automatics · Rails & Handguards

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Best price

$324.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$324.99checked Oct 1, 2026	Out of stock	Buy at Brownells

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Dashed line = out of stock. Tracking since Sep 28, 2026.

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Store	Latest	Lowest	Highest
Brownells	$324.99	$324.99	$324.99

Since Sep 28, 2026.

About this part

The Mk4 10" Federal Super Modular Rail M-LOK Gray is a 1E+1" AR-15 handguard from Geissele Automatics. One store lists it, Brownells at $324.99.

Fits and works with

Handguard length: 1E+1" · Barrels

Specifications

Manufacturer: Geissele Automatics
Color: Grey
Platform: AR-15
Length: 10"
Attachment: M-LOK

From the manufacturer

This is the same rail used to fullfill contracts for the Federal Bureau of Investigation (FBI). Its strength, modularity and M-Lok compatibility gives users the capabilities needed to successfully complete the mission at hand. These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o'clock positions. The Picatinny rail on the bottom of the rail, or the 6 o'clock position, is elongated in this version to accommodate accessories more comfortably. Maximum venting for heat dissipation also dramatically reduces the rails overall weight, while maintaining its same strong and rigid platform. The MK4 M-LOK rail f Mfg: Geissele Automatics