Geissele Super Modular Rail MK4 M-LOK Free Float Handguard AR-15 Aluminum


Category: Product ID: 10631


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 rails 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″ 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.



  • M-LOK compatible
  • Integrated picatinny rail sections at the fore of the rail at 3, 6 and 9 o’clock

Product Information

Finish Black
Material Aluminum
Length 15 Inches
Weight 13.3 Ounce
Rail Style Customizable
Gas System Length Extended Rifle
Outside Diameter 2.11 Inches
Inside Diameter 1.35 Inches
Compatible With

Delivery Information

Shipping Weight 1.445 Pounds


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