Super Modular Rail MK4 M-LOK®

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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. Maximum venting for heat dissipation also dramatically reduces the rail's overall weight, while maintaining its same strong and rigid platform. Utilizing Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45 quadrants. The SMR MK4 is both versatile and modular, allowing the user to tailor their platform to his or her unique needs.

The SMR MK4 also features Geissele's proprietary 2.25" long barrel nut. This increases the surface contact where the rail interfaces with the receiver and creates a platform that can be trusted to be straight and true the entire length of the free float rail. This increases accuracy and zero repeatability during disassembly and reassembly when performing maintenance.

For a 10" variant of this rail, please see the SMR MK4 Federal

NOTE: IF THIS IS YOUR FIRST TIME PURCHASING A GEISSELE AUTOMATICS RAIL, YOU WILL NEED TO PURCHASE A BARREL NUT WRENCH IN ORDER TO PROPERLY INSTALL THE RAIL. CLICK HERE TO PURCHASE

NOTE: SAVE 50% OFF A SUPER GAS BLOCK (NITRIDE) WITH PURCHASE OF THIS RAIL. CLICK HERE TO PURCHASE 

HEIGHT:   2.4"
COLOR:   Black or DDC
MATERIAL:   6061-T6
FINISH:   Type 3 Hardcoat Anodize
AVAILABLE LENGTHS:   9.5", 13.5", 15"
INNER DIAMETER:   1.35"
OUTER DIAMETER (DAQ*):   2.11"
SMR MK4 9.5" WEIGHT:   9.3oz (11.2oz w/ barrel nut)
SMR MK4 13.5" WEIGHT:   11.8oz (13.5oz w/ barrel nut)
SMR MK4 15" WEIGHT:   12.8oz (15.1oz w/ barrel nut)

 

*DAQ - Distance Across Quadrants

Click Here to review our DDC (Desert Dirt Color) disclaimer before purchasing.

Our rails are designed to work with Mil-Spec M4 upper receivers. The compatibility with billet receiver sets is unknown.

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SPECIAL OFFER: GET 50% OFF A SUPER GAS BLOCK (Nitride) WITH PURCHASE OF THIS RAIL. IF THIS IS YOUR FIRST TIME PURCHASING A SUPER MODULAR RAIL, YOU WILL NEED A GEISSELE BARREL NUT WRENCH TO ENSURE PROPER INSTALLATION.