How to Mount a Picatinny Rail on a Floating Forearm

A floating forearm is a floating, tube-style front handguard; it is generally found on AR style assault rifles. These devices often improve accuracy and handling. The floating forearm has no contact with the barrel, and produces better accuracy by reducing muzzle vibration that typically transfers to your hands. Picatinny rails are mounted on some floating forearm models. These rails provide a means to secure accessories such as lights, grips, lasers or other tactical combat equipment.

Things You'll Need

  • C-Clamp or Padded bench vise
  • Marker
  • Drill
  • Tap
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Instructions

    • 1

      Unload the weapon completely. Visually inspect the weapon to ensure no ammunition is present.

    • 2

      Disassemble your weapon's floating forearm. Consult your owner's manual -- or forearm installation manual -- for specific instructions that apply to your weapon.

    • 3

      Secure the forearm to a table with a C-clamp, or place it in a padded bench vise. Ensure that the outer surface of the forearm is facing toward you..

    • 4

      Place the Picatinny rail on the forearm in your desired position. Mark the rail's guide-holes on the forearm using a marker.

    • 5

      Drill the guide holes in the forearm using a drill bit slightly smaller than the diameter of the rail's mounting screws.

    • 6

      Tap the guide holes with a tapping tool to fit the threads of the rail's mounting screws. Work the tap slowly back and forth to ensure proper thread structure.

    • 7

      Set the rail on the forearm. Line up the holes you just drilled and tapped with the holes on the rail. Insert the screws, and secure the forearm interior with the provided nuts and washers.