# US 10,767,954 B1 · Barrel harmonizing assembly and method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,954 B1 - Document ID: US10767954B1 - Status: Granted - Kind: B1 - Application number: 16/512,675 - Filed: 2019-07-16 - Granted: 2020-09-08 - Earliest claimed: 2019-07-16 - Applicants: Charles M. Howard - Inventors: Charles M. Howard - Web page: https://patentgrep.com/patent/US10767954B1 ## CPC - F41A 21/32: Muzzle attachments or glands (F41A21/26, F41A21/30, F41A21/46 take precedence {; for projectile velocity measurements G01P3/665, G01P3/685}) - F41A 21/44: Insulation jackets; Protective jackets - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE ## Abstract A barrel harmonizing assembly and method for a firearm in which a cylindrical harmonizer sleeve, as well as a pair of tuning nuts which are threadedly positioned on the harmonizer sleeve for longitudinal tuning movement, are positioned around the barrel, rather than projecting from the forward end of the barrel, in order to provide improved tuning and to permit the use, as part of the assembly, of a flash hider, a recoil compensator, a suppressor or other device on the end of the barrel to further improve the accuracy of the barrel and/or provide other benefits. ## Claims ### Claim 1 A harmonizing assembly comprising: a cylindrical sleeve having an internal passageway extending therethrough configured to receive, and to position the cylindrical sleeve around an exterior of, a longitudinal portion of a barrel of a firearm, the cylindrical sleeve having threads around at least a portion of a longitudinal exterior of the cylindrical sleeve; a first tuning nut which is threadedly received around, and is longitudinally repositionable along, the longitudinal exterior of the cylindrical sleeve; a second tuning nut which is threadedly received around, and is longitudinally repositionable along, the longitudinal exterior of the cylindrical sleeve, the second tuning nut being threadedly tightenable against the first tuning nut; and an inwardly extending radial shoulder at a forward longitudinal end of the cylindrical sleeve, the inwardly extending radial shoulder being configured to deliver an externally threaded forward end segment of the barrel through the inwardly extending radial shoulder at the forward longitudinal end of the cylindrical sleeve such that the inwardly extending radial shoulder is retained by an exterior shoulder of the barrel, wherein the externally threaded forward end segment of the barrel has a reduced outer diameter and the exterior shoulder of the barrel is located at a reward longitudinal end of the externally threaded forward end segment of the barrel. ### Claim 2 (depends on 1) The harmonizing assembly of claim 1 further comprising a threaded retainer which is threadedly receivable on the externally threaded forward end segment of the barrel to retain the cylindrical sleeve around the exterior of the longitudinal portion of the barrel. ### Claim 3 (depends on 2) The harmonizing assembly of claim 2 further comprising a washer positioned between the threaded retainer and the forward longitudinal end of the cylindrical sleeve. ### Claim 4 (depends on 2) The harmonizing assembly of claim 2 wherein the threaded retainer is a locknut, a jam nut, a flash hider, a recoil compensator, or a suppressor. ### Claim 5 (depends on 1) The harmonizing assembly of claim 1 further comprising a bonding agent applied between an interior surface of the internal passageway of the cylindrical sleeve and the exterior of the longitudinal portion of the barrel. ### Claim 6 (depends on 5) The harmonizing assembly of claim 5 wherein the bonding agent is a high temperature adhesive ceramic cement, a high temperature silicone bonding agent, or a high temperature epoxy bonding agent. ### Claim 7 (depends on 1) The harmonizing assembly of claim 1 wherein: the cylindrical sleeve has a longitudinal length of from 1.5 to 3.0 inches; the first tuning nut has a longitudinal width of from 0.5 to 1.0 inch; and the second tuning nut has a longitudinal width of from 0.5 to 1.0 inch. ### Claim 8 An assembly for a firearm comprising: a barrel of a firearm; a cylindrical harmonizer sleeve positioned around an exterior of a longitudinal portion of the barrel, the cylindrical harmonizer sleeve having threads around at least a portion of a longitudinal exterior of the cylindrical harmonizer sleeve; a first tuning nut which is threadedly received around, and is longitudinally repositionable along, the longitudinal exterior of the cylindrical harmonizer sleeve; a second tuning nut which is threadedly received around, and is longitudinally repositionable along, the longitudinal exterior of the cylindrical sleeve, the second tuning nut being threadedly tightenable against the first tuning nut; and the cylindrical harmonizer sleeve having an inwardly extending radial shoulder at a forward longitudinal end of the cylindrical harmonizer sleeve through which an externally threaded forward end segment of the barrel projects, wherein the inwardly extending radial shoulder at the forward longitudinal end of the cylindrical harmonizer sleeve is retained by an exterior shoulder of the barrel, the externally threaded forward end segment of the barrel has a reduced outer diameter, and the exterior shoulder of the barrel is located at a reward longitudinal end of the externally threaded forward end segment of the barrel. ### Claim 9 (depends on 8) The assembly of claim 8 further comprising a threaded retainer which is threadedly received on the externally threaded forward end segment of the barrel. ### Claim 10 (depends on 9) The assembly of claim 9 further comprising a washer which is held by the threaded retainer against the forward longitudinal end of the cylindrical harmonizer sleeve. ### Claim 11 (depends on 9) The assembly of claim 9 wherein the threaded retainer is a locknut, a jam nut, a flash hider, a recoil compensator, or a suppressor. ### Claim 12 (depends on 8) The assembly of claim 8 further comprising a bonding agent between an interior surface of the cylindrical harmonizer sleeve and the exterior of the longitudinal portion of the barrel. ### Claim 13 (depends on 12) The assembly of claim 12 wherein the bonding agent is a high temperature adhesive ceramic cement, a high temperature silicone bonding agent, or a high temperature epoxy bonding agent. ### Claim 14 (depends on 8) The assembly of claim 8 wherein: the cylindrical harmonizer sleeve has a longitudinal length of from 1.5 to 3.0 inches; the first tuning nut has a longitudinal width of from 0.5 to 1.0 inch; and the second tuning nut has a longitudinal width of from 0.5 to 1.0 inch. ### Claim 15 A method of harmonizing a barrel of a firearm comprising the steps of: a) placing a harmonizing sleeve assembly on the barrel comprising a cylindrical sleeve which is positioned around an exterior of a longitudinal portion of the barrel, the cylindrical sleeve having threads around at least a portion of a longitudinal exterior of the cylindrical sleeve and the cylindrical sleeve having an inwardly extending radial shoulder at a forward longitudinal end of the cylindrical sleeve through which an externally threaded forward end segment of the barrel projects, the externally threaded forward end segment of the barrel having a reduced outer diameter, a first tuning nut which is threadedly positioned around the longitudinal exterior of the cylindrical sleeve at a longitudinal tuning location, and a second tuning nut which is threadedly positioned around the longitudinal exterior of the cylindrical sleeve and is tightened against the first tuning nut at the longitudinal tuning location; b) retaining the harmonizing sleeve assembly on the barrel by threadedly tightening a threaded retainer on the externally threaded forward end segment of the barrel such that the inwardly extending radial shoulder at the forward longitudinal end of the cylindrical sleeve is held in fixed position between the threaded retainer and an exterior shoulder of the barrel which is located at a reward longitudinal end of the externally threaded forward end segment of the barrel; c) tiring a plurality of shots from the barrel to determine a grouping of the shots; and d) moving the first and second tuning nuts longitudinally to a different longitudinal tuning location around the exterior of the cylindrical sleeve to obtain a tighter grouping of shots. ### Claim 16 (depends on 15) The method of claim 15 wherein the threaded retainer is a locknut, a jam nut, a flash hider, a recoil compensator, or a suppressor. ### Claim 17 (depends on 15) The method of claim 15 further comprising applying a bonding agent between an interior surface of the cylindrical sleeve and the exterior of the longitudinal portion of the barrel. ### Claim 18 (depends on 17) The method of claim 17 wherein the bonding agent is a high temperature adhesive ceramic cement, a high temperature silicone bonding agent, or a high temperature epoxy bonding agent. ### Claim 19 (depends on 15) The method of claim 15 wherein: the cylindrical sleeve has a longitudinal length of from 1.5 to 3.0 inches; the first tuning nut has a longitudinal width of from 0.5 to 1.0 inch; and the second tuning nut has a longitudinal width of from 0.5 to 1.0 inch. ### Claim 20 (depends on 15) The method of claim 15 wherein step (b) comprises the steps of (i) placing a washer on the externally threaded forward end segment of the barrel between the forward longitudinal end of the cylindrical sleeve and the threaded retainer and (b) clamping the inwardly extending radial shoulder at the forward longitudinal end of the cylindrical sleeve between the washer and the exterior shoulder of the barrel by tightening the threaded retainer on the externally threaded forward end segment of the barrel.