Free floating rail for a firearm

• US 9,389,043 B1
• Filed: 06/05/2015
• Issued: 07/12/2016
• Est. Priority Date: 06/05/2015
• Status: Active Grant

• Current Assignee: Hongjun Zhang
• Original Assignee: Hongjun Zhang
• Inventors: Zhang, Hongjun
• Primary Examiner(s): Lee, Benjamin P
• Application Number:
  US14/732,225
• Time in Patent Office: 403 Days
• Field of Search: 42/85, 42/90, 42/72, 42/750.2, 42/750.3, 42/710.1
• US Class Current: 1/1
• CPC Class Codes: F41C 23/16 Forestocks; Handgrips; Hand guards pump-action guns F41C7/02

Abstract

A rail is mounted solely to a barrel nut so that the rail is free-floating and does not affect movement of the barrel when the firearm is fired. The rail may have first and second wedges that are drawn together and frictionally engage a smooth exterior surface of the barrel nut in order to frictionally engage the wedges and the barrel nut. The first and second wedges have contact surfaces defined by a radius which is equal to a radius of the exterior surface of the barrel nut. By forming the contact surfaces of the first and second wedges to have a radius equal to the radius of the barrel nut, the maximum area of the contact surfaces contact or engage the exterior surface of the barrel nut to maximize frictional engagement between the barrel nut and the wedges.

Claims

1. A rail mountable to a barrel nut of a firearm, the rail comprising:

an elongate tube sized and configured to fit over a barrel of the firearm, the elongate tube defining a proximal portion, the proximal portion having a through first aperture for providing access to an exterior surface of the barrel nut;

a first wedge sized and configured to be received into the through first aperture, the first wedge traversable between an engaged position wherein the first wedge directly contacts and applies pressure to the exterior surface of the barrel nut to frictionally hold the elongate tube onto the barrel nut of the firearm, and a disengaged position wherein the first wedge does not apply sufficient pressure to hold the elongate tube on the barrel nut and allows the rail to be removed from the barrel nut; and

a fastener for drawing the first wedge to the engaged position,

wherein the first wedge defines a first contact surface having a curvature, the curvature having a radius equal to a radius of the exterior surface of the barrel nut.

2. The rail of claim 1 further comprising:

a through second aperture formed in the proximal portion of the elongate tube for providing access to the exterior surface of the barrel nut;

a second wedge sized and configured to be received into the through second aperture, then second wedge traversable between the engaged position wherein the second wedge directly contacts and applies pressure to the exterior surface of the barrel nut.

3. The rail of claim 2 wherein the rail has a mounting base, and further comprises:

a bolt insertable through through holes of the mounting base and the second wedge and threadably attachable to a threaded hole of the first wedge.

4. The rail of claim 2 wherein the second wedge defines a second contact surface having a curvature, the curvature having a radius equal to a radius of the exterior surface of the barrel nut.

5. The rail of claim 2 wherein the mounting base and the first and second wedges are centered to a center of the rail so that the first and second wedges evenly applies pressure against the barrel nut.

6. A free floating rail system for attachment to a firearm, the system comprising:

a rail mountable to a barrel nut of a firearm, the rail comprising;

an elongate tube sized and configured to fit over a barrel of the firearm, the elongate tube defining a proximal portion, the proximal portion having a through first aperture for providing access to an exterior surface of the barrel nut;

a first wedge sized and configured to be received into the through first aperture, the first wedge traversable between an engaged position wherein a contact surface of the first wedge directly contacts and applies pressure to an exterior surface of a barrel nut to frictionally hold the elongate tube onto the barrel nut of the firearm and a disengaged position wherein the first wedge does not apply sufficient pressure to hold the elongate tube on the barrel nut and allows the rail to be removed from the barrel nut;

a fastener for drawing the first wedge to the engaged position;

the barrel nut attachable to a threaded proximal portion of a receiver of the firearm, the barrel nut having a cylindrical exterior surface which receives the contact surface of the first wedge.