US2850828A - Aluminum alloy gun barrel with a lubricating film - Google Patents

Aluminum alloy gun barrel with a lubricating film Download PDF

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Publication number
US2850828A
US2850828A US344401A US34440153A US2850828A US 2850828 A US2850828 A US 2850828A US 344401 A US344401 A US 344401A US 34440153 A US34440153 A US 34440153A US 2850828 A US2850828 A US 2850828A
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United States
Prior art keywords
barrel
weight
coating
bore
approximately
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Expired - Lifetime
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US344401A
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English (en)
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George C Sullivan
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Individual
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Individual
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Priority to BE557981D priority Critical patent/BE557981A/xx
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Priority to US344401A priority patent/US2850828A/en
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Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/24—Barrels or gun tubes with fins or ribs, e.g. for cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F41A21/04—Barrel liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/12—Cartridge chambers; Chamber liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/20—Barrels or gun tubes characterised by the material

Definitions

  • This invention relates to a firearm or more particularly to a barrel construction wherein the design and materials employed are of such a nature that the resultant product is a minimum in weight. This is accomplished in such a manner that other factors necessary in a practical and successful gun barrel, such as strength and life, are not jeopardized.
  • the present invention also provides a method of making arearm barrel, or the like, comprising the steps of machining the barrel from an aluminum alloy blank,
  • the alloy blank itself may be originally formed in a tubular shape by the use of various well known techniques, thus integrally containing a bore which can be finished as described hereinafter.
  • the recoil normally increases. . While it has been found that the increase in recoil is not fatiguing to the average shooter, it may be found desirable to provide a ⁇ recoil minimizing device.
  • This invention is particularly advantageous in that the decreased weight of the basic material in the barrel will allow a larger barrel cross-section which decreases barrel whip and therefore increases shooting accuracy.
  • This larger barrel cross-section can be carried to the muzzle, thus permitting the use of a muzzle brake orblast device which can be designed into and form a part of the barrel itself. rthis feature permits a construction that is streamlined, pleasing to the eye in comparison to present devices, economical of manufacture barrel which is advantageous in the event of a military' weapon and its accompanying bayonet.
  • a gun barrel construction in which preferably a non-ferrous alloy is used in conjunction with a hard-plated barrel or bore; a sleeve or liner being incorporated near the chamber of the barrel if desired.
  • the preferred alloy is comprised essentially of aluminum combined with one or more group metals such as zinc, magnesium and copper.
  • group metals such as zinc, magnesium and copper.
  • a material dis covered to he practical and workable in this application has the following constituents; aluminum 88.5%, magnesium 2.5%, zinc 5.5%, copper 1.5%, chromium 0.30%; the remainder consisting of impurities. Obviously, these metals can be varied within reasonable limits without the resultant material being affected.
  • a preferred material of this type is a wrought alloy which has received solution heat treatment and elevated temperature aging, and is formed by rolling or preferably by extrusion processes.
  • An alternate aluminum alloy material which may be preferred later is one in which the amount of alloying metals, notably magnesium and zinc, has been increased over that disclosed above. This material is stronger in that the ultimate tensile strengths have been increased approximately 8% to date, such material being somewhat experimental in nature at the present time.
  • a barrel of the above mentioned material will not withstand repeated tiring unless a hardplating is applied to its internal bore.
  • a typical method of chromium plating would be to insert an anode or cathode bar through the bore of the barrel and immerse the combination in an electrolyte for the plating operation; all in accordance with well-known current procedure.
  • the barrel should be anodized first and then ground to remove the oxide below the area to be plated.
  • the barrel may be desirable to give the barrel a flash of copper or nickel to seal the alloy material from water penetration causing corrosion and to prepare a better bonding surface for the chromium plate.
  • the plating is then applied by standard methods. It has been found wise to rotate the barrel during the plating operation to minimize the possibility of uneven plating thickness.
  • Effort is made to control the thickness of the plating in order to eliminate subsequent machine operations; however, it is to be understood that the plating can be increased and later reduced to finish Idimensions by polishing, grinding, teaming, honing, or the like, machine operations.
  • One type coating can be created by passing a current through an oxidizing solution,
  • a coating treatment which has resulted in a'fine product consists of an electrolytic bath containing principally sulphuric acid, the temperature of which has been lowered to approximately 30 to 32 F.
  • the use of carbon dioxide as a temperature reducing medium has been found to be excellent in that the carbon dioxide not only performs a refrigerating function but enters into the reaction in such a way that the resultant composition of coating has extremely good resistance to wear.
  • Oxalic acid can be added to the bath solution thus permitting higher bath temperatures and resultant lowered costs of operation, but the coating may suffer some in physical characteristics.
  • the hard coating type of process distinguishable from the plating process in that the hard coating is formed from the basic material of the barrel itself instead of depositing a plating of another material on the barrel, is advantageous in that there is a surface impregnation which renders a highly efiicient joint action between the hard coating and the basic material of the barrel.
  • a dimensional growth may be associated with the formation of the hard oxide films, and this feature should be taken into consideration in the design of the barrel.
  • the oxide surface although extremely hard, can be finished by honing, lapping, or the like, methods to produce very smooth surfaces.
  • Oils and greases have been applied for years in an effort to minimize corrosion, but such are difficult to use, are temporary in application, are impractical in extremely cold or hot weather, tend to pick up extraneous matter such as sand and the like, and thus have little utility for all-around use.
  • the dry lubricant film of this invention eliminates these undesirable features.
  • a gun barrel when treated according to the processes above described has excellent resistance to corrosion and erosion and if designed with taper its performance can be substantially improved.
  • the dry lubricant film further enhances the utility and performance of the barrel.
  • Figure 1 is a side View of a typical barrel incorporating the present invention in part;
  • Figure l being shown in an enlarged and cross-sectioned manner;
  • Figure 2 is a cross-sectional view of the barrel showing details 0f the plating or hardecoating and including the provision of a sleeve or liner;
  • Figure 3 is a sectional view of the barrel showingthe plating or coating applied to the bore;
  • Figure 4 is an elevational cross-sectioned view of the chamber portion of the barrel, showing an alternate liner
  • Figure 5 is a sectional view of the barrelshowing said alternate liner
  • Figure 6 is a sectional View of the muzzle end of the barrel showing an integral recoil minimizing device, including the plating or hard-coating and the dry lubricant film of this invention;
  • Figure 7 is a sectional view of an alternate design of barrel in which the chamber is incorporated in a liner, cooling fins provided about the chamberV area, and the bore being so processed that it is provided with a tapered internal diameter;
  • Figure 8 shows a general method of'hard plating the barrel and obtaining a tapered bore if desired.
  • Figure 9 is an enlarged sectional view of Figure 6 showing both the plating or hard-coating and the dry lubricant film of this invention.
  • the composite barrel of the present invention includes a barrel body 10 formed of a lightweight material such as aluminum alloy, having the usual bore 11 which may be ried in the usual manner to provide interior helical-like lands 12 and grooves 13.
  • the barrel 10 is provided at its rear end with anV externally threaded shank 14 or other typical means ,by which the barrel may be attached to the action or receiver.
  • the barrel 10, and particularly the bore 11, is coated.
  • the chamber 16 and the threads 14 can .be blocked off or masked by using a vinyl tape or the like,
  • the barrel can, if desired, be substantially maaction. chine finished prior to plating or coating, leaving .001
  • the rear end of the barrel 10 contains the usual charnber 16, the size and shape of which is determined by the cartridge and caliber used.
  • the explosion pressures are a maximum in the area of the chamber 16 and reduce in the direction of the muzzle 17. While available light weight metals have been found to have sufficient strength to withstand with safety the explosion pressures encountered, it may be advisable, if a barrel of exceedingly low weight is wanted, to incorporate a sleeve 18 around the chamber 16 area where pressures are at a maximum.
  • An alternate sleeve or liner 19 may be incorporated adjacent the chamber 16; this typey of strengthening element having the additional advantage of being removable and replaceable in event of excessive erosion dueto repeated firing. Both the sleeve 18 and the liner 19 may be installed by sweating the parts together or by furnace brazing, or by other standard fastening means.
  • the heat producedas a result of firing y tends to increase joint efficiency action and thus permit each element to absorb yits proportion of the stresses produced.
  • the sleeve 18 can drop into detents 20 for.
  • securityand the liner 19 can be secured by conventional means, such as threading and the like.
  • the sleeve 18 or liner 19 is preferably made of a highstrength metal such as stainless steel, which has a tensile strength approaching 125,000 pounds per square inch, or a titanium alloy having a tensile strength in excess of 150,000 pounds per square inch; the latter having the additional advantage of light weight. High strength ferrous materials may also be used.
  • a typical material ofthe titanium type is a titanium alloy containing approximately chromium and 3% aluminum as produced by the P. R. Mallory Company; other comparable titanium alloys being produced now by the Remington Company.
  • the muzzle 17 can, if desired, be constructed with a recoil absorbing device, as disclosed in Figure 6.
  • the blast chamber 21 can be formed in several ways, by undercutting from the muzzle end of the barrel or by drilling a hole 22 and inserting a plug 23 therein; the plug 23 having an inside diameter slightly greater than the groovediameter of the bore 11 and being attached by conventional means such as threading 24, or the like.
  • Blast holesl 25 are drilled through the barrel 11 to provide gas exit and recoil absorption.
  • Figure 6 shows the plating or hard coating being applied not only to the bore 11 but also to the outside of the barrel.
  • Figure 6 also showsV a dry lubricant film 40 which can be applied to the coating 15; the combination of the coating and film being particularly meritorious.
  • a barrel 26 incorporates a liner 27 constructed of a high strength material.
  • the barrel 26 includes fins 28 about the chamber area for cooling purposes.
  • the liner 27 A can be attached to the barrel 26 by conventional means;
  • Figure 7 shows, in an exaggerated manner, a plating or hard coating 35 which is comparatively thin adjacent the chamber of the barrel and which gradually increases in thickness as the muzzle is approached. This tapering effect is advantageous in that the accuracy of the barrel is improved considerably, while permitting the lowering of critical breech pressures, or the raising of bullet muzzle velocity. Tapered rifling is also of advantage in that with such a construction a bullet jacket can be fabricated of a harder material, thus allowing greater penetrating power.
  • the taper of the barrel bore is obtained as a result of the hard coating process, as shown by Figure 8.
  • the barrel 26, having a constant bore diameter as a result of machining procedures, is placed within a tank 36 which contains an electrolytic solution 37, as hereinbefore described.
  • the barrel 26 is preferably inserted about a cathode rod 38 which may be negatively charged and which is spaced therefrom by appropriate techniques and means now employed in the plating industry.
  • the barrel 26 may be positively charged to an anode in such a manner that a current flows through the electroyte 37 to accomplish the formation of the hard lcoating 35.
  • the bore can be treated by inserting the total barrel into the solution at one time; the bore having a close fitting flexible plunger or piston which extends the length of the barrel and is slowly pulled therefrom to produce a tapered bore. After treatment the barrel is preferablytransferred to a cold water rinse to remove any residual electrolyte.
  • FIG 9 a sectional view of Figure 6, has been enlarged to point out the resultant plating or hard coating 15 and also the lubricant film 40; the latter may be applied to the barrel assembly, which may consist of the liner, bore, chamber or the inside or outside contour of the barrel as is desired.
  • T-he film 40 can be varied both in formulation and ingredients, however, l have found that a preferred material comprises a formulated resin binder, graphite and molybdenum disulfide.
  • a typical material would consist of (l) a binder (for instance, an epon or melmac resin base) amounting to approximately 225 parts by weight; (2) molybdenum disulfide (M052) in an amount approximating 225 parts by weight and (3) graphite (finely ground) in an amount approximating 25 parts by weight.
  • binder for instance, an epon or melmac resin base
  • M052 molybdenum disulfide
  • graphite finely ground
  • This material can be thinned with xylene or equivalent for ease in operation and application. It has been found that application by spray methods result in a good and consistent film; however, in the gun barrel of this invention I have found that dipping procedures are entirely satisfactory.
  • the barrel can be dipped into a tank which contains the film material and removed slowly, after which it is allowed to air dry for at least fifteen minutes. if desired, a second film can then be applied by repeating the process. While it is not absolutely necessary, I have found it desirable to cure the film by baking in a controlled temperature environment at approximately 325 degrees Fahrenheit for at least a period of thirty minutes. This preferred treatment results in a film with a thickness of from one-eighth to one-half mil as may be required.
  • rifle barrel has been chosen for illustration and description, it will be understood that the invention is equally applicable to machine guns, shot guns or small arms barrels, such as revolvers or automatics. It may be also applied to other types of firearms or ordnance where reduced weight is desirable, such as mobile field or tank guns, infantry mortars, recoilless rifies and the like. Smooth bore firearms are well adaptable to this process of manufacture.
  • a firearm the combination of a barrel constructed of a lightweight high thermal conductivity aluminum alloy, a liner mounted in the chamber area of said barrel, a layer of porous material upon the surfaces of said barrel, and a substantially permanent, solid, lubricating film upon said porous layer which extends into the pores of said porous layer, said solid lubricating film comprising approximately 225 parts by weight of molybdenum disulfide, approximately 225 parts by weight of resinous binder, and approximately 25 parts by weight of graphite.
  • a firearm barrel made of light weight non-ferrous metal alloy having upon at least its bore surface a layer of porous material, and a substantially permanent dry lubricating film upon said porous layer which extends into the pores of said porous layer, said dry lubricating film comprising approximately 225 parts by Weight of binder, approximately 225 parts by Weight of molybdenum disulfide, and approximately 25 parts by Weight of graphite.
  • a firearm barrel made of a light Weight non-ferrous metal alloy having upon at least its bore surface a layer of porous material, said layer of porous material being composed essentially of an oxide of the metal which forms the major portion of the barrel, and a substantially permanent dry lubricating lm upon said porous layer which extends into the pores of said porous layer, said dry lubricating iilm comprising approximately 225 parts by Weight of binder, approximately 225 parts by Weight of molybdenum disulfide, and approximately 25 parts by Weight of graphite.
  • a firearm barrel assembly made of light Weight nonferrous metal alloy having upon at least its bore surface a layer of porous material, and a substantially permanent dry lubricating lin upon said porous layer which extends into the pores of said porous layer, said dry lubricating film comprising approximately 225 parts by Weight of binder, approximately 225 parts by Weight of molybdenum disulfide, and approximately 25 parts by Weight of graphite.
  • a rearm barrel madeV of light.
  • Weight, ⁇ highthermal conductivity aluminum alloy having upon at least its bore surface, a layer of porous material, and a substantially permanent dry baked lubricating film upon said porous layer which extends into the pores of said porous layer, said dry baked lubricating lm comprising approximately 225 parts by Weight of binder, approximately 225 parts by Weight of molybdenum disulfide, and approximately 25 parts by Weight of graphite, said lm having a thickness of from Ms to 1/z mil.
  • a firearm part made of light weight aluminum al-V and approximately 25 parts of nely ground graphite,
  • said lilm having a thickness of from 1A; to 1/2 mil.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubricants (AREA)
US344401A 1953-03-24 1953-03-24 Aluminum alloy gun barrel with a lubricating film Expired - Lifetime US2850828A (en)

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BE557981D BE557981A (ko) 1953-03-24
US344401A US2850828A (en) 1953-03-24 1953-03-24 Aluminum alloy gun barrel with a lubricating film

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052590A (en) * 1959-04-09 1962-09-04 Du Pont Heat-seal apparatus and process
US3261121A (en) * 1961-10-13 1966-07-19 Joseph R Eves Gun barrel with explosively welded liner
US3339304A (en) * 1965-10-23 1967-09-05 Emhart Corp Shotgun gauge adapter
WO1985005173A1 (en) * 1984-05-02 1985-11-21 General Electric Company Wear resistant gun barrel and method of forming
US4982648A (en) * 1986-11-21 1991-01-08 Battelle-Institut E.V. Gun barrel cooling arrangement
EP0442106A1 (de) * 1990-02-16 1991-08-21 DIEHL GMBH & CO. Startvorrichtung, insbesondere für eine Unterwasserwaffe und Verfahren zu ihrer Herstellung
US5531150A (en) * 1994-03-14 1996-07-02 Lockheed Missiles & Space Company Lightweight gun systems
DE19617280C1 (de) * 1996-04-30 1997-10-09 Sig Schweiz Industrieges Druckgas-Schußwaffe
US6250007B1 (en) * 1999-05-27 2001-06-26 Koch Supplies Holdings Llc Cattle stunning gun improvement
US6482248B1 (en) 2000-11-28 2002-11-19 Magnum Research, Inc. Aluminum composite for gun barrels
US20110173864A1 (en) * 2010-01-06 2011-07-21 Jason Christensen Segmented composite barrel for weapon
US20110200840A1 (en) * 2006-05-04 2011-08-18 Schlumberger Technology Corporation Cylinder with polycrystalline diamond interior
US9618290B1 (en) * 2013-10-15 2017-04-11 Christopher M. Redmon Weapon barrel assembly
US20190178598A1 (en) * 2017-12-08 2019-06-13 James Eric McMillan Concentric rifle barrel assembly
US20200141682A1 (en) * 2017-12-08 2020-05-07 James Eric McMillan Concentric rifle barrel assembly
US10890399B2 (en) * 2018-07-02 2021-01-12 Gog Paintball, S.A. Barrel with rifling and method for forming
US20220042758A1 (en) * 2017-06-01 2022-02-10 Willow Associates, LLC Machine Gun Infantry "KT-7.62"
US11306989B2 (en) * 2019-08-15 2022-04-19 Vista Outdoor Operations Llc Devices and methods for extraction of high pressure cartridge casings
US20220316836A1 (en) * 2021-04-06 2022-10-06 The United States Of America, As Represented By The Secretary Of The Navy Interchangeable modular chamber system for a firearm

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1207218A (en) * 1914-01-19 1916-12-05 L Aluminium Francais Soc Process of producing metallic deposits.
US1346190A (en) * 1919-12-15 1920-07-13 Frank A Fahrenwald Firearm and alloy for making same
US2104319A (en) * 1934-02-10 1938-01-04 Remington Arms Co Inc Manufacture of rifled tubes
FR831030A (fr) * 1937-04-01 1938-08-18 Canon pour fusils ou autres armes
US2156803A (en) * 1934-05-03 1939-05-02 Cooper Products Inc Lubricant
US2361211A (en) * 1943-05-08 1944-10-24 Westinghouse Electric & Mfg Co Lubrication of dies
US2395044A (en) * 1942-04-02 1946-02-19 Walter T Gorton Gun
US2413022A (en) * 1943-09-22 1946-12-24 George A Woody Method of forming firearm barrels
US2440634A (en) * 1943-10-14 1948-04-27 Gen Motors Corp Shell feeding mechanism for rocket guns
US2466642A (en) * 1946-01-23 1949-04-05 Shell Dev Metal lubricant compositions
US2543741A (en) * 1948-12-02 1951-02-27 Richfield Oil Corp Lubricating and sealing composition of flake copper, powdered lead, graphite, and petroleum vehicle
US2686155A (en) * 1950-01-17 1954-08-10 Westinghouse Electric Corp Process for producing a molded solid molybdenum disulfide lubricant member
US2736119A (en) * 1956-02-28 Firearm having chamber member

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736119A (en) * 1956-02-28 Firearm having chamber member
US1207218A (en) * 1914-01-19 1916-12-05 L Aluminium Francais Soc Process of producing metallic deposits.
US1346190A (en) * 1919-12-15 1920-07-13 Frank A Fahrenwald Firearm and alloy for making same
US2104319A (en) * 1934-02-10 1938-01-04 Remington Arms Co Inc Manufacture of rifled tubes
US2156803A (en) * 1934-05-03 1939-05-02 Cooper Products Inc Lubricant
FR831030A (fr) * 1937-04-01 1938-08-18 Canon pour fusils ou autres armes
US2395044A (en) * 1942-04-02 1946-02-19 Walter T Gorton Gun
US2361211A (en) * 1943-05-08 1944-10-24 Westinghouse Electric & Mfg Co Lubrication of dies
US2413022A (en) * 1943-09-22 1946-12-24 George A Woody Method of forming firearm barrels
US2440634A (en) * 1943-10-14 1948-04-27 Gen Motors Corp Shell feeding mechanism for rocket guns
US2466642A (en) * 1946-01-23 1949-04-05 Shell Dev Metal lubricant compositions
US2543741A (en) * 1948-12-02 1951-02-27 Richfield Oil Corp Lubricating and sealing composition of flake copper, powdered lead, graphite, and petroleum vehicle
US2686155A (en) * 1950-01-17 1954-08-10 Westinghouse Electric Corp Process for producing a molded solid molybdenum disulfide lubricant member

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3052590A (en) * 1959-04-09 1962-09-04 Du Pont Heat-seal apparatus and process
US3261121A (en) * 1961-10-13 1966-07-19 Joseph R Eves Gun barrel with explosively welded liner
US3339304A (en) * 1965-10-23 1967-09-05 Emhart Corp Shotgun gauge adapter
WO1985005173A1 (en) * 1984-05-02 1985-11-21 General Electric Company Wear resistant gun barrel and method of forming
US4577431A (en) * 1984-05-02 1986-03-25 General Electric Company Wear resistant gun barrel and method of forming
US4982648A (en) * 1986-11-21 1991-01-08 Battelle-Institut E.V. Gun barrel cooling arrangement
EP0442106A1 (de) * 1990-02-16 1991-08-21 DIEHL GMBH & CO. Startvorrichtung, insbesondere für eine Unterwasserwaffe und Verfahren zu ihrer Herstellung
US5531150A (en) * 1994-03-14 1996-07-02 Lockheed Missiles & Space Company Lightweight gun systems
DE19617280C1 (de) * 1996-04-30 1997-10-09 Sig Schweiz Industrieges Druckgas-Schußwaffe
US6250007B1 (en) * 1999-05-27 2001-06-26 Koch Supplies Holdings Llc Cattle stunning gun improvement
US6482248B1 (en) 2000-11-28 2002-11-19 Magnum Research, Inc. Aluminum composite for gun barrels
US20110200840A1 (en) * 2006-05-04 2011-08-18 Schlumberger Technology Corporation Cylinder with polycrystalline diamond interior
US8020333B2 (en) * 2006-05-04 2011-09-20 Schlumberger Technology Corporation Cylinder with polycrystalline diamond interior
US8261480B2 (en) 2006-05-04 2012-09-11 Hall David R Rigid composite structure with a superhard interior surface
US20110173864A1 (en) * 2010-01-06 2011-07-21 Jason Christensen Segmented composite barrel for weapon
US8677670B2 (en) * 2010-01-06 2014-03-25 Jason Christensen Segmented composite barrel for weapon
US9618290B1 (en) * 2013-10-15 2017-04-11 Christopher M. Redmon Weapon barrel assembly
US20220042758A1 (en) * 2017-06-01 2022-02-10 Willow Associates, LLC Machine Gun Infantry "KT-7.62"
US11774204B2 (en) * 2017-06-01 2023-10-03 Willow Associates, LLC Machine gun infantry “KT-7.62”
US10533820B2 (en) * 2017-12-08 2020-01-14 U.S. Arms Company Llc Concentric rifle barrel assembly
US20200141682A1 (en) * 2017-12-08 2020-05-07 James Eric McMillan Concentric rifle barrel assembly
US20190178598A1 (en) * 2017-12-08 2019-06-13 James Eric McMillan Concentric rifle barrel assembly
US10890399B2 (en) * 2018-07-02 2021-01-12 Gog Paintball, S.A. Barrel with rifling and method for forming
US11306989B2 (en) * 2019-08-15 2022-04-19 Vista Outdoor Operations Llc Devices and methods for extraction of high pressure cartridge casings
US11788811B2 (en) 2019-08-15 2023-10-17 Federal Cartridge Company Devices and methods for extraction of high pressure cartridge casings
US20220316836A1 (en) * 2021-04-06 2022-10-06 The United States Of America, As Represented By The Secretary Of The Navy Interchangeable modular chamber system for a firearm
US11933568B2 (en) * 2021-04-06 2024-03-19 The United States Of America, As Represented By The Secretary Of The Navy Interchangeable modular chamber system for a firearm

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