Purpose-built Geissele MK4 Federal rail system with integrated M-LOK slots and Picatinny sections. Lightweight, rigid, and heat-vented design trusted by federal agencies.
The Geissele MK4 Federal is a 10-inch modular rail system engineered for serious shooters who demand versatility without compromise. This is the same platform trusted by federal law enforcement agencies for its proven reliability and performance.
Integrated Mounting Options
Lightweight & Rigid Design
This rail system balances modularity with practicality. The combination of M-LOK and Picatinny mounting gives you flexibility to attach lights, lasers, grips, and other accessories exactly where you need them. The purposeful venting keeps your rifle cooler during extended shooting sessions while reducing overall system weight—a critical advantage for tactical applications or long-range work.
Whether you're building a precision rifle, a duty weapon, or a versatile platform for multiple roles, the Geissele MK4 Federal delivers the strength and adaptability professional shooters expect.