Geissele MK4 Federal Super Modular 10" M-LOK Rail

Geissele MK4 Federal Super Modular Rail System

The Geissele MK4 Federal represents the pinnacle of modern rail design—a system engineered for serious shooters who demand modularity without compromise.

Design & Construction

This 10-inch rail features a purpose-built architecture that balances weight savings with structural integrity. Maximum venting throughout the rail body dramatically reduces overall weight while maintaining exceptional rigidity and strength.

Mounting Options

The system provides multiple attachment solutions:

• Integrated M1913 Picatinny rail sections at the 3, 6, and 9 o'clock positions for traditional rail-mounted accessories
• M-LOK slots at the 3, 6, and 9 o'clock positions, plus upper 45-degree quadrants for modern, lightweight accessory mounting
• Elongated bottom Picatinny rail (6 o'clock position) for comfortable accommodation of tactical lights, lasers, and other underslung gear

Real-World Proven

This is the same rail system trusted by the Federal Bureau of Investigation. Its proven track record in demanding operational environments speaks to its reliability and performance.

What You Get

A lightweight, modular platform that lets you configure your rifle exactly as you need it—without unnecessary weight or bulk. Whether you're running a precision rifle, tactical carbine, or competition build, the MK4 Federal adapts to your mission.

Note: Barrel nut wrench and gas block sold separately.