Geissele 10" Super Mod Mk4 Fed OD Green

The Geissele 10" Super Mod Mk4 Fed OD Green is a purpose-built modular rifle rail system trusted by federal law enforcement. Built to the same exacting standard as rails fielded by the FBI, this 10-inch handguard combines proven strength with thoughtful modularity, making it a go-to choice for shooters who need a robust, adaptable platform for both duty and sport shooting. The OD Green finish pairs tactical aesthetics with a classic color option favored by precision shooters and hunters alike.

Strength and weight management don't have to be at odds. This rail leverages strategic ventilation throughout its aluminum body to shed heat and keep overall weight down without sacrificing rigidity or durability. The result is a handguard that won't fatigue your support arm during long range sessions or field work, yet remains rock-solid under recoil and hard use.

Modularity is built in from the design phase. Integrated M1913 Picatinny rail sections sit at the 3, 6, and 9 o'clock positions, with an elongated 6 o'clock Picatinny section that gives you extra room to mount larger accessories comfortably. M-LOK slots round out the system—positioned at the 3, 6, and 9 o'clock positions plus the upper 45-degree quadrants—so you can attach lights, grips, and other gear exactly where you need them without over-burdening the rail.

Whether you're setting up a patrol rifle, precision build, or modern sporting rifle, the Geissele 10" Super Mod Mk4 Fed OD Green delivers the versatility to run your preferred accessories and the durability to keep pace with serious shooters.

Key Features

• Purpose-built to FBI contract specifications—proven durability and design
• Integrated M1913 Picatinny rails at 3, 6, and 9 o'clock, with extended 6 o'clock section for larger accessories
• M-LOK compatibility at 3, 6, 9 o'clock and upper 45-degree quadrants for flexible accessory mounting
• Aluminum construction with strategic ventilation for reduced weight and improved heat dissipation
• 10-inch length suited for mid-length and carbine builds
• OD Green finish

Specifications

Frequently Asked Questions

What firearms is this rail compatible with?

The Geissele 10" Super Mod Mk4 Fed is designed for AR-platform rifles. Confirm your specific upper receiver and barrel nut compatibility before purchase.

Can I mount both Picatinny and M-LOK accessories on the same rail?

Yes. The rail features integrated M1913 Picatinny sections at the 3, 6, and 9 o'clock positions (with an extended 6 o'clock section) and M-LOK slots at those same positions plus the upper 45-degree quadrants. You can use either standard on the same rail system.

Is this rail lighter than solid aluminum handguards?

Yes. The ventilation design reduces overall weight compared to solid rails while maintaining the same strength and rigidity.

What makes the 6 o'clock Picatinny section special?

The elongated Picatinny rail on the bottom (6 o'clock) provides extra space to mount larger or bulkier accessories such as tactical lights or bipods without interference or cramping.