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The Geissele Automatics Super Modular rail MK4 was designed to be a lightweight modular rail system that also provides you with Magpul M-LOK attachment points in several locations along the length of the rail. The MK4 features an ergonomic design, with a flexible and modular set up procedure. The free floating design is strong and rigid, and features an integrated M1913 Picatinny rail section at 3, 6, and 9 o'clock. Accessory rails are easy to install and do not require a gunsmith. However if you do not have the required tools or mechanical know how you should seek the help of an expert.

Specifications and Features:
Geissele Automatics AR-15 Free Float Rail 05-315B 
15" Super Modular Rail
MK4 with Magpul M-LOK attachment system
Picatinny rails sections at 3, 6, and 9 o'clock
Ergonomic
Free Floating
Modular
Lightweight, Strong and Rigid
Black
Fits:
AR-15 Rifles