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Geissele Automatics MK4 Federal
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

Geissele Automatics

MK4 Federal

$400.00
Low Stock (5 left) California compliant

Geissele Automatics MK4 Federal, Super Modular Rail, 10", M-LOK, Black, Barrel Nut Wrench Sold Separately (GEI-02-243), Gas Block Not Included 05-430B

Key Details
Brand Geissele Automatics
Manufacturer Part Number 05-430B
UPC 817953027905
SKU GEI05-430B
Current Stock 5 available
Quantity Updated Apr 25, 2026 12:45 AM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

This is the same rail used to fulfill contracts for the Federal Bureau of Investigation (FBI). It's 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 more comfortably accommodate accessories. 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 features M-LOK slots at the 3, 6 and 9 o'clock positions as well as the upper 45-degree quadrants. This allows the user to keep the weight on the rail system down, while keeping the modularity and versatility to attach accessories as necessary.

Features
  • - Free Float
  • - M-LOK Mounting Surface
Specifications
UPC: 817953027905
Manufacturer: Geissele Automatics
Manufacturer Part #: 05-430B
Model: MK4 Federal
Model (Alt): MK4
Size: 10"
Type: Handguard