Geissele Automatics was established in 2004 as a manufacturer of trigger mechanisms for the AR-15 rifle. Rely on Geissele when you expect superior performance, quality, and reliability.

The Super Modular Rail (SMR) MK8 M-LOK is Geissele's ultra-modular model. The SMR MK8 is one of the first rails available to utilize the Magpul M-LOK technology. These rails are designed to give the user full modularity while maintaining a strong and rigid platform. Maximum venting at the lower 45° quadrants create maximum heat dissipation and also dramatically reduces the rail's overall weight. Utilizing Magpul's M-LOK technology at the 3, 6, and 9 o'clock positions, as well as the upper 45° quadrants. The SMR MK8 is both versatile and modular, allowing the user to tailor their platform to his or her unique needs. The SMR MK8 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. .

Features and Specifications:
Manufacturer Number: 05-286S
Integrated M1913 picatinny rail sections at the fore of the rail in the 3, 6 and 9 o'clock position
Magpul M-LOK technology
Geissele's proprietary 2" long barrel nut
Height:2.3"
Length:15"
ID*:1.35"
OD*/DAQ*:2.11"
Weight:12.4 oz.
Installed Weight (w/ Hardware):14.3 oz.
Color: DDC - Desert Dirt Color

Fits:
Mil-Spec M4 upper receivers

Does not include Gas Block.
Barrel Nut wrench sold separately, please order ARR-295-133 for the wrench