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GSR™ 13.5 Free Float Tube Dark Earth / Item No: GS-3541

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Product Description

The Patented [US Patent No. D724,171] Gear Sector™ GSR™ Free Float Tube provides a one piece, light weight, rugged, handguard that when installed gives you a continuous 12 o’clock rail. The GSR™ utilizes a proprietary barrel nut that can be installed on any 5.56⁄2.23 based AR platform. It was designed with the top 1913 Picatinny rail for mounting most common accessories, but does away with the need for rails at the traditional 3, 6, and 9 o’clock positions. GSR™ mod slot accessories can be attached directly to the tube utilizing a light weight T-nut attachment system. The GSR™ Free Float Tube comes complete with all necessary hardware, screws, hex keys, barrel nut wrench, Aeroshell Grease 33ms, and Vibra-Tite® to make installation fast and easy. No shims are required, nor are they provided.

Materials & Construction

The GSR™ Free Float Tube is constructed using multiple base materials and is precision CNC machined from 6061-T6 extrusion. Material and finish processes are outlined below:

  • Tube Material: 6061-T6 Aluminum
  • Tube Finish: Cerakote™ Dark Earth ( H-235 ) over clear Type III, Class II Hard Coat
  • Inside Diameter: 1.30″
  • Outside Diameter: 1.76″
  • Tube Weight: 11.40 ozs.
  • Barrel Nut Material: Heat treated steel
  • Barrel Nut Finish: Military Specification ( MIL-DTL-16232G ) Manganese Phosphate
  • Barrel Nut Weight: 2.24 ozs.
  • Compliance: 100% Berry Amendment Compliant
  • Origin: Proudly Made in the USA

Package Contents

The GSR™ Free Float Tube comes complete with the following components:

  • 1ea. GSR™ 13.5 Free Float Tube
  • 1ea. GSR™ barrel nut
  • 1ea. GSR™ barrel nut wrench
  • 1ea. ½ oz Aeroshell Grease 33ms for barrel nut / receiver threads
  • 5ea. 8×32 5⁄16ths long cap screws for attaching tube to barrel nut
  • 1ea. 3⁄32nd hex key for securing tube retaining screws
  • 1ea. Vibra-Tite® VC3™ thread locking compound
  • 1ea. Installation instructions

Installation Instructions

Click on the PDF icon to your left to download the user manual for this product. The instructions are in Adobe Acrobat’s Portable Document Format (PDF). You will need Adobe Acrobat Reader version 5.0 or higher to view and print the instructions.

If you do not have Adobe’s Acrobat Reader, you can download a free copy at