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The Geissele Automatics Super Modular rail MK8 was designed to be a lightweight ultra-modular rail system that also provides you with Magpul M-LOK attachment points in several locations along the length of the rail. The MK8 features an ergonomic design, with a flexible and modular set up procedure. The free floating design is strong, rigid, and designed to be compatible with Mil-Spec M4 Upper Receivers. The compatibility with billet receiver sets is unknown.

Specifications and Features:
Geissele Automatics AR-15 Free Float Rail 05-284S 
9.5" Super Modular Rail MK8
MK8 with Magpul M-LOK attachment system
M-LOK Compatible rails sections at 3, 6, and 9 o'clock
Ergonomic
Free Floating
Modular
Lightweight, Strong and Rigid
Inner Diameter 1.35"
Outside Diameter 2.11"
Overall Weight 8.4oz, with Hardware Installed 10.3oz
Desert Dirt Color
Fits:
AR-15 Rifles