Hard-Line MLOK® Rail System - 13" - Cerakote

Overt Industries

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Introducing the Overt Industries AR-15 Hard-Line MLOK® Rail System 

The Hard-Line MLOK® Rail System was designed with an emphasis on Rigidity, Ruggedness, and Simplicity. 100% Made in the USA, the Hard-Line MLOK® Rail System utilizes a Three Point Mounting System to ensure that the handguard clamps securely to the barrel nut without the possibility of unwanted rotation.

Machined from American sourced 7075 T-6 extruded aluminum, the Hard-Line MLOK® Rail System offers increased strength, rigidity and reduces overall handguard flex by removing often unused MLOK® sections in order to enhance the structure of the rail system. The increase in handguard rigidity reduces handguard flex resulting in a stronger mounting structure for Laser Aiming Devices. We also integrated chamfered serrations to the exterior of the rail system in order to provide maximum grip friction to the end user. 


  • Easy to install Three Point Mounting System
  • Free float design
  • Chamfered Serrations and Leading Edges 
  • Ambidextrous Integrated QD Sockets 
  • 7-Sided M-LOK®
  • 2" M-LOK® Attachment
  • American sourced 7075 T-6 extruded aluminum
  • 4140 Steel Barrel Nut
  • Single Color Cerakote
Length Without Barrel Nut & Hadware With Barrel Nut & Hadware
7.5" 6oz 10oz
10.5" 8oz 12oz
13" 10oz 14oz
15" 12oz 16oz


The Hard-Line Rail System Requires a Standard 1-3/16" Barrel Nut Wrench or Crows foot - A barrel nut wrench is not included with the Rail System. If you need a barrel nut Wrech, they are available HERE

The photos listed are taken indoor using studio lights, exact color shade may slighly vary in natural lighting conditions. 

Overt Industries Reliability: Overt Industries is known for its commitment to quality and innovation. We 100% QC every Hard-Line MLOK® Rail System, embodying our Hard Use - Zero Sacrifice Ethos. 


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