Super Modular Rail MK4 Federal M-LOK

Geissele Super Modular Rail MK4 Federal M-LOK

The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-rugged M-LOK option. These rails are custom-engineered and feature integrated M1913 Picatinny rail sections at the front of the rail in the 3, 6, and 9 o’clock positions. Maximum ventilation for heat dissipation drastically reduces the rail’s overall weight while maintaining the same strong and rigid platform. Magpul’s M-LOK technology is used at the 3, 6, and 9 o’clock positions, as well as in the upper 45-degree quadrants. The SMR MK4 is both versatile and modular, allowing users to customize their platform to their individual needs.

The SMR MK4 also features the 2.25"-long barrel nut developed by Geissele. This increases the surface contact at the interface between the rail and the receiver, creating a platform that is straight and precise along the entire length of the free-floating rail. This enhances accuracy and zero-point repeatability during disassembly and reassembly for maintenance.