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) 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" 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: 05-315S
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:13.1 oz.
Installed Weight (w/ Hardware):15 oz.
Color: DDC - Desert Dirt Color

Fits:
Mil-Spec M4 upper receivers

Note: This product is new and being closed out; sold "As Is" and is not returnable to Cheaper Than Dirt. Please contact the manufacturer for warranty and assistance.