The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-rugged M-LOK option. 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 Super Modular Rail MK4 M-LOK™ is Geissele’s ultra-lightweight M-LOK option. 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 Super Modular Rail (SMR) MK4 M-LOK is Geissele’s ultra-lightweight M-LOK option. 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 MK4 M-LOK rail features M-LOK slots at the 3, 6 and 9 o’clock positions as well as the upper 45° 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.

The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-combat M-LOK option. These rails are purpose-built and feature integrated M1913 picatinny rail sections at the fore end of the rail in the 3, 6 and 9 o’clock positions.

The Super Modular Rail MK4 M-LOK from Geissele is an ultra-lightweight option for full-size AR builds. At 15 inches in length, these rails are purpose-built and feature integrarted Picatinny rail sections at the front of the rail in the 3, 6, and 9 o'clock positions.

The Super Modular Rail (SMR) MK4 M-LOK™ is Geissele’s ultra-lightweight M-LOK option. 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 MK4 M-LOK rail features M-LOK slots at the 3, 6 and 9 oclock positions as well as the upper 45 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.

* Our 10.3″ Crane Spec AR15 upper features the ideal gas port sizing (.070) to achieve minimal gas blowback when ran suppressed. This unit is specifically designed to be ran in conjunction …

Made from tough 6061-T6 Aluminum, then finished with Type 3 Anodized Hardcoat, you can rely on the MK4 rail to hold your tactical accessories in place when you need them the most. The MK4 rail is congruous with the majority of low-profile gas blocks.