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The Super Modular Rail Mk4 MLOK from Geissele Automatics is an excellent choice for an upgrade on your M4 or new AR15 build. This free float rail system provides a lightweight yet rock solid foundation for your M-4s accessories and front sight. It is precision machined from aircraft grade aluminum and hard coat anodized. It requires the use of a low profile gas block. Accessory rails are not included, sold separately. 

Specifications and Features:
Aerospace grade aluminum
Hard coat anodized
Barrel nut and hardware included
9.5" overall length
Inside diameter 1.35"
Outside diameter 2.11"
Weight including barrel nut 12.8 oz
Black