# US 10,309,748 B2 · Firearm rail/handguard and mounting system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,748 B2 - Document ID: US10309748B2 - Status: Granted - Kind: B2 - Application number: 15/873,382 - Filed: 2018-01-17 - Published: 2018-07-19 - Granted: 2019-06-04 - Earliest claimed: 2017-01-17 - Assignees: Samson Manufacturing Corporation - Applicants: Samson Manufacturing Corp. - Inventors: Scott Samson; Tanner Landis; Andrew Dreher - Web page: https://patentgrep.com/patent/US10309748B2 ## CPC - F41C 23/16: Forestocks; Handgrips; Hand guards (pump-action guns F41C7/02) - F41A 3/66: Breech housings or frames; Receivers - F41A 21/48: Barrel mounting means, e.g. releasable mountings for replaceable barrels - F41C: SMALLARMS, e.g. PISTOLS, RIFLES (functional features or details common to both smallarms and ordnance, mountings therefor F41A; projecting missiles without use of explosive or combustible propellant charge F41B); ACCESSORIES THEREFOR - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract An assembly for mounting a handguard to a firearm utilizes a biasing element disposed intermediate the barrel nut and the interior end of the handguard and a clamping element also disposed intermediate the barrel nut and the interior end of the handguard but positioned opposite the biasing element about the perimeter of the barrel nut. One or both of the biasing element and clamping element have multiple surfaces which mimic portions of the exterior profile of the barrel nut to prevent any of longitudinal, axial, or radial misalignment of the handguard relative to the axis of the firearm barrel. ## Claims ### Claim 1 An assembly apparatus for securing a handguard to a firearm having a barrel nut, the assembly apparatus comprises: a handguard having a first end with an interior diameter shaped to receive at least a portion of an exterior of the barrel nut; a biasing element disposable intermediate the barrel nut and the interior diameter of the handguard, the biasing element having first and second biasing surfaces disposable adjacent first and second exterior surface portions, respectively, of the barrel nut; a first mechanism for securing the biasing element intermediate the handguard and the barrel nut, a clamping element having first and second surfaces disposed adjacent first and second exterior surface portions, respectively, of the barrel nut; and a second mechanism for securing the clamping element intermediate the handguard and the barrel nut. ### Claim 2 (depends on 1) The apparatus of claim 1 in combination with a cylindrical barrel nut extending along an axis and having an exterior perimeter defining first and second exterior surface portions with different exterior diameter values relative to the axis. ### Claim 3 (depends on 1) The apparatus of claim 1 wherein the biasing element prevents movement of the handguard longitudinally along the axis of the barrel. ### Claim 4 (depends on 1) The apparatus of claim 1 wherein the biasing element has an arcuate surface disposable adjacent the exterior perimeter of the barrel nut to prevent at least one of radial and rotational movement of the handguard first end relative the barrel nut. ### Claim 5 (depends on 1) The apparatus of claim 1 wherein the clamping element has an arcuate surface disposable adjacent the exterior perimeter of the barrel nut to prevent at least one of radial and rotational movement of the handguard first end relative the barrel nut. ### Claim 6 An assembly kit for use with a firearm having a barrel nut and a handguard, the kit comprising: a biasing element disposable intermediate the barrel nut and an interior diameter of the handguard; a first mechanism for securing the biasing element intermediate the handguard and the barrel nut, a clamping element having first and second surfaces disposed adjacent first and second exterior surface portions, respectively, of the barrel nut; and a second mechanism for securing the clamping element intermediate the handguard and the barrel nut. ### Claim 7 (depends on 6) The assembly kit of claim 6 wherein the biasing element has an arcuate surface for positioning adjacent the exterior perimeter of the barrel nut to prevent at least one of radial and rotational movement of the handguard first end relative the barrel nut. ### Claim 8 (depends on 6) The assembly kit of claim 6 wherein the clamping element has an arcuate surface disposable adjacent the exterior perimeter of the barrel nut to prevent at least one of radial and rotational movement of the handguard first end relative the barrel nut. ### Claim 9 (depends on 6) The assembly kit of claim 6 in combination with a cylindrical barrel nut extending along an axis and having an exterior perimeter defining first and second exterior surface portions with different exterior diameter values relative to the axis. ### Claim 10 (depends on 6) The assembly kit of claim 6 in combination with a handguard having a first end with an interior diameter shaped to receive at least a portion of a barrel nut exterior thereagainst. ### Claim 11 A method for mounting a handguard to a firearm having a cylindrical barrel nut, the method comprising: A) disposing a first end of the handguard about a portion of the barrel nut; B) inserting a biasing element intermediate the first end of the handguard and the barrel nut at a first location about an exterior perimeter of the barrel nut; C) inserting a clamping element intermediate the first end of the handguard and the barrel nut at a second location opposite the first location about the exterior perimeter of the barrel nut, the clamping element having first and second surfaces disposed adjacent first and second exterior surface portions, respectively, of the barrel nut; and D) urging the clamping element against the barrel nut. ### Claim 12 (depends on 11) The method of claim 11 wherein the step of urging the clamping element against the barrel nut comprises rotating a mechanism for securing to force the clamping element against a surface of the barrel nut. ### Claim 13 (depends on 11) The method of claim 11 further comprising E) exposing the barrel nut of the firearm. ### Claim 14 An assembly apparatus for securing a handguard to a firearm, the firearm having a barrel nut with an exterior perimeter, the assembly apparatus comprises: a handguard having a first end with an interior diameter shaped to receive at least a portion of the exterior portion of the barrel nut; and a first clamping element disposable intermediate the interior diameter of the handguard and a first location on the exterior perimeter of the barrel nut, the first clamping element having an arcuate surface with a first radius of diameter and disposable adjacent the first location on the exterior perimeter of the barrel nut, a second clamping element disposable intermediate the interior diameter of the handguard and a second location on the exterior perimeter of the barrel nut opposite the first location, the second clamping element having an arcuate surface with the first radius of diameter and disposable adjacent the second location on the exterior perimeter of the barrel nut, wherein one of the first and second clamping elements has a second arcuate surface having the second radius of diameter and disposable adjacent the exterior perimeter of the barrel nut. ### Claim 15 (depends on 14) The assembly apparatus of claim 14 further comprising: a first mechanism for securing the first clamping element intermediate the handguard and the barrel nut. ### Claim 16 (depends on 15) The assembly apparatus of claim 15 further comprising: a second mechanism for securing the second clamping element intermediate the handguard and the barrel nut.