The Geissele Automatics SMR or Super Modular Rail is an Ultra Rugged Picatinny/M-LOK Solution

The Geissele Automatics Super Modular Rail (SMR) MK4 is an incredible durable AR-15 free float hand guard with some unique features. You will notice a full length m1913 picatinny rail runs the entirety of the top of the hand guard while small picatinny rail sections sit on the front of the hand guard at the 3, 6, and 9 O' Clock positions. Further increasing the modularity of this rail is the use of M-LOK slots in the same orientation as the small picatinny rail sections, and again full length M-LOK slots located on the upper 45 quadrants. The rail is made from 6061-T6 aluminum with a hard coat anodized finish. The proprietary barrel nut can only be installed with a Geissele barrel nut wrench which is sold separately.

Geissele Automatics AR-15 Super Modular Rails MK4 M-LOK (Black) Specifications and Features:

• Geissele Automatics 05-1656B
• Super Modular Rails MK4 M-LOK
• 10.5" Free Float Hand Guard
• Full Length Top Picatinny 1913 Rail
• Abbreviated Picatinny 1913 Rail Sections at 3,6, and 9 O' Clock
• M-LOK Sections at 3,6 and 9 O' Clock and Upper 45 Quadrants
• Proprietary Barrel Nut (Requires Separate Purchase of Barrel Nut Wrench 02-243F)
• Height 2.4"
• Inner Diameter 1.35"
• Outer Diameter 2.11"
• Overall Weight 10.6oz (12.74 with Barrel Nut)
• 6061-T6 Aluminum
• Type 3 Hard Coat Anodized
• Black

Does NOT Include:

• Barrel Nut Wrench

Fits:

• Mil-Spec AR-15/M4 Upper Receivers

Note:
Compatibility with billet receiver sets is unknown.