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WO2003033987A1 - Barrel conversion for a gun - Google Patents

Barrel conversion for a gun Download PDF

Info

Publication number
WO2003033987A1
WO2003033987A1 PCT/GB2002/004657 GB0204657W WO03033987A1 WO 2003033987 A1 WO2003033987 A1 WO 2003033987A1 GB 0204657 W GB0204657 W GB 0204657W WO 03033987 A1 WO03033987 A1 WO 03033987A1
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
gun
conversion
bore
rifled
Prior art date
Application number
PCT/GB2002/004657
Other languages
French (fr)
Inventor
Michael Ernest Saxby
Richard Furse
Original Assignee
Lambeth Properties Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lambeth Properties Limited filed Critical Lambeth Properties Limited
Priority to US10/492,991 priority Critical patent/US20050028421A1/en
Priority to CA002463820A priority patent/CA2463820A1/en
Priority to EP02767721A priority patent/EP1436566A1/en
Publication of WO2003033987A1 publication Critical patent/WO2003033987A1/en

Links

Classifications

    • 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
    • F41A21/10—Insert barrels, i.e. barrels for firing reduced calibre ammunition and being mounted within the normal barrels

Definitions

  • This invention relates to gun barrels, in particular, but not strictly limited to pistol barrels, and provides a conversion for a gun barrel to accommodate shooting of low energy bullets.
  • the function of the angled barrel is two-fold. Firstly, there is a tendency for self loading pistols to move; as the slide of the automatic weapon moves backwards, the barrel tends to move downwards.
  • the angle of the bore is designed to compensate for a loss of accuracy due to the downward movement of the barrel.
  • the angled bore compensates for a relatively slower trajectory of a low energy (i.e., slower travelling) bullet relative to live ammunition. Accuracy's of around 200mm over a 10,000mm range are achievable with these conversions, independent of shooter proficiency.
  • the angled barrel conversion goes some way to improving the accuracy of aim achievable with low energy bullets (relative to a standard pistol barrel)
  • the correction angle used to offset the gun's movement as the slide recoils cannot account for differences in proficiency of a shooter.
  • the arrangement takes no account of sideways movement of the barrel which is also known to occur on firing of the gun.
  • the present invention aims to provide an improved barrel conversion which significantly increases the accuracy of the gun irrespective of shooter proficiency.
  • a barrel conversion for a gun comprising; an external, peripheral surface suitably configured to fit and cycle the gun whose barrel is to be converted and a stepped internal bore, the stepped internal bore comprising a first, rifled portion of a first internal diameter extending from the chamber of the gun, and a second, clearance portion of a second internal diameter, the clearance portion extending from the rifled portion to the exit of the barrel, and the second internal diameter being larger than the first internal diameter.
  • the external peripheral surface may be the external peripheral surface of the original barrel of the gun to be converted, or alternatively may be retrofitted.
  • the converted barrel may have a different length to the original barrel of the gun to be converted.
  • the rifled portion of the bore is designed according to conventional practices to accommodate the dimensions of the bullets to be fired from the converted barrel.
  • the clearance portion of the bore has a diameter which, as a minimum, is sufficiently large to permit the bullet to be fired from the converted barrel to fly unrestricted during involuntary movement of the gun. Factors to be considered in selecting a suitable diameter may include, the size, speed and trajectory of the bullet to be fired and/or the length of the clearance portion, or of the barrel itself.
  • the conversion may be effected by insertion of a bored liner into the existing barrel.
  • the bored liner may provide just the rifled portion of the stepped bore, the internal diameter of the remainder of the original barrel providing the clearance portion.
  • a rifled bore portion of a length between about 45mm to 80mm has been found to be most effective, more preferably a length of between about 50mm to 75mm.
  • a length of about 65mm has been found to provide an accuracy of around a 40mm diameter in a converted semi-automatic pistol.
  • the rifled bore portion of the barrel may be angled to the longitudinal axis of the barrel to compensate for the trajectory of slower bullets.
  • Figure 1 shows a prior art arrangement of a converted barrel of a pistol.
  • Figure 2 shows an embodiment of a barrel conversion according to the invention for a pistol similar to that referred to in relation to Figure 1.
  • a gun barrel 1 of known construction is modified for firing low energy training ammunition by the provision of a liner 2, within the bore 3 of the original barrel 1 of the gun (not shown) to be modified.
  • the liner 2 extends the full length of the bore 3 of the barrel 1.
  • the liner 2 has its own longitudinal bore 4 which extends the length of the liner 2.
  • the longitudinal bore 4 has an axis B' which is angled to the longitudinal axis A of the barrel 1 in a generally upwardly direction when the gun (not shown) is aimed for shooting the training ammunition.
  • the angle is typically about 6 to 8 degrees from the longitudinal axis A of the barrel 1.
  • a gun barrel 1' similar to that shown in Figure 1 is modified in accordance with one embodiment of the present invention.
  • a liner 2' Inside the barrel 1', there is inserted a liner 2'.
  • the liner 2' is significantly shorter in length than the bore 3' of the barrel 1', the liner 2' being approximately 55-60% of the length of the bore 3'.
  • the liner 2' has a longitudinal bore 4' with an axis B' which, optionally, is angled to the longitudinal axis A' of the barrel 1' in a generally upwardly direction when the gun (not shown) is aimed for shooting the training ammunition.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Toys (AREA)

Abstract

A barrel conversion for a gun comprises; an external, peripheral surface suitably configured to fit and cycle the gun whose barrel (l') is to be converted and a stepped internal bore. The stepped internal bore comprises a first, rifled portion (4') of a first internal diameter extending from the chamber of the gun, and a second, clearance portion (3') of a second internal diameter, the clearance portion (3') extending from the rifled portion (4') to the exit of the barrel (1'), and the second internal diameter being larger than the first internal diameter.

Description

BARREL CONVERSION FOR A GUN
This invention relates to gun barrels, in particular, but not strictly limited to pistol barrels, and provides a conversion for a gun barrel to accommodate shooting of low energy bullets.
It is known to modify guns originally designed for shooting live ammunition to enable the shooting of low energy bullets for training purposes. In the case of automatic pistols, it is known to replace the entire barrel with a specially adapted barrel having a bore angled at several degrees to the longitudinal axis of the barrel in a generally upwards direction when the gun is aimed. The bore may, simply, be adapted by insertion of a bored liner into the existing barrel.
The function of the angled barrel is two-fold. Firstly, there is a tendency for self loading pistols to move; as the slide of the automatic weapon moves backwards, the barrel tends to move downwards. The angle of the bore is designed to compensate for a loss of accuracy due to the downward movement of the barrel. Secondly, the angled bore compensates for a relatively slower trajectory of a low energy (i.e., slower travelling) bullet relative to live ammunition. Accuracy's of around 200mm over a 10,000mm range are achievable with these conversions, independent of shooter proficiency.
Whilst the angled barrel conversion goes some way to improving the accuracy of aim achievable with low energy bullets (relative to a standard pistol barrel), the correction angle used to offset the gun's movement as the slide recoils cannot account for differences in proficiency of a shooter. Also, the arrangement takes no account of sideways movement of the barrel which is also known to occur on firing of the gun. The present invention aims to provide an improved barrel conversion which significantly increases the accuracy of the gun irrespective of shooter proficiency.
In accordance with the present invention, there is provided a barrel conversion for a gun comprising; an external, peripheral surface suitably configured to fit and cycle the gun whose barrel is to be converted and a stepped internal bore, the stepped internal bore comprising a first, rifled portion of a first internal diameter extending from the chamber of the gun, and a second, clearance portion of a second internal diameter, the clearance portion extending from the rifled portion to the exit of the barrel, and the second internal diameter being larger than the first internal diameter.
The external peripheral surface may be the external peripheral surface of the original barrel of the gun to be converted, or alternatively may be retrofitted. The converted barrel may have a different length to the original barrel of the gun to be converted. The rifled portion of the bore is designed according to conventional practices to accommodate the dimensions of the bullets to be fired from the converted barrel. The clearance portion of the bore has a diameter which, as a minimum, is sufficiently large to permit the bullet to be fired from the converted barrel to fly unrestricted during involuntary movement of the gun. Factors to be considered in selecting a suitable diameter may include, the size, speed and trajectory of the bullet to be fired and/or the length of the clearance portion, or of the barrel itself. As with the prior art arrangements, the conversion may be effected by insertion of a bored liner into the existing barrel. The bored liner may provide just the rifled portion of the stepped bore, the internal diameter of the remainder of the original barrel providing the clearance portion.
Where the gun to be converted is a semi-automatic pistol, for most pistols of this type, a rifled bore portion of a length between about 45mm to 80mm has been found to be most effective, more preferably a length of between about 50mm to 75mm. A length of about 65mm has been found to provide an accuracy of around a 40mm diameter in a converted semi-automatic pistol.
It has been found that, by shortening the rifled portion of the barrel sufficiently, the flight time of a bullet fired from the converted gun, in the rifled portion of the barrel can be reduced to a period which is less than the time taken for any significant movement of the barrel to result from the firing or cycling of the weapon. Hence the bullet is in "free flow" when any involuntary movement of the barrel occurs and it's trajectory is not impaired or altered by such movement.
Optionally, the rifled bore portion of the barrel may be angled to the longitudinal axis of the barrel to compensate for the trajectory of slower bullets.
An embodiment of the invention will now be further described by way of example, with reference to the figures in which:
Figure 1 shows a prior art arrangement of a converted barrel of a pistol.
Figure 2 shows an embodiment of a barrel conversion according to the invention for a pistol similar to that referred to in relation to Figure 1.
As can be seen from Figure 1 a gun barrel 1 of known construction is modified for firing low energy training ammunition by the provision of a liner 2, within the bore 3 of the original barrel 1 of the gun (not shown) to be modified. The liner 2 extends the full length of the bore 3 of the barrel 1.
The liner 2 has its own longitudinal bore 4 which extends the length of the liner 2. The longitudinal bore 4 has an axis B' which is angled to the longitudinal axis A of the barrel 1 in a generally upwardly direction when the gun (not shown) is aimed for shooting the training ammunition. The angle is typically about 6 to 8 degrees from the longitudinal axis A of the barrel 1.
As can be seen in Figure 2, a gun barrel 1' similar to that shown in Figure 1 is modified in accordance with one embodiment of the present invention. Inside the barrel 1', there is inserted a liner 2'. The liner 2' is significantly shorter in length than the bore 3' of the barrel 1', the liner 2' being approximately 55-60% of the length of the bore 3'. The liner 2' has a longitudinal bore 4' with an axis B' which, optionally, is angled to the longitudinal axis A' of the barrel 1' in a generally upwardly direction when the gun (not shown) is aimed for shooting the training ammunition.

Claims

1. A barrel conversion for a gun comprising; an external, peripheral surface suitably configured to fit and cycle the gun whose barrel is to be converted and a stepped internal bore, the stepped internal bore comprising a first, rifled portion of a first internal diameter extending from the chamber of the gun, and a second, clearance portion of a second internal diameter, the clearance portion extending from the rifled portion to the exit of the barrel, and the second internal diameter being larger than the first internal diameter.
2. A barrel conversion for a gun as claimed in claim 1 wherein the external peripheral surface the external peripheral surface of the original barrel of the gun to be converted.
3. A barrel conversion as claimed in claim 1 wherein the external, peripheral surface forms part of a retro-fitted barrel.
4. A barrel conversion as claimed in any preceding claim wherein the gun to be converted is a semi-automatic pistol and the rifled bore portion has a length between about 45mm to 80mm
5. A barrel conversion as claimed in claim 4 wherein the rifled bore portion has a length of between about 50mm to 75mm.
6. barrel conversion as claimed in claim 4 or claim 5 wherein the rifled bore portion has a length of about 65mm.
7. A barrel conversion as claimed in any preceding claim wherein the rifled bore portion is angled to the longitudinal axis of the barrel.
8. A barrel conversion as claimed in any preceding claim wherein at least the rifled bore portion of the stepped bore is provided in the form of a bored liner inserted into an existing gun barrel.
9. A gun having a barrel conversion as claimed in any preceding claim.
10. A barrel conversion substantially as described herein and with reference to Figure 2.
11. A gun having a barrel conversion substantially as described herein and with reference to Figure 2.
PCT/GB2002/004657 2001-10-17 2002-10-14 Barrel conversion for a gun WO2003033987A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/492,991 US20050028421A1 (en) 2001-10-17 2002-10-14 Barrel conversion for a gun
CA002463820A CA2463820A1 (en) 2001-10-17 2002-10-14 Barrel conversion for a gun
EP02767721A EP1436566A1 (en) 2001-10-17 2002-10-14 Barrel conversion for a gun

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0124908.5 2001-10-17
GB0124908A GB2381060A (en) 2001-10-17 2001-10-17 Barrel conversion for a gun

Publications (1)

Publication Number Publication Date
WO2003033987A1 true WO2003033987A1 (en) 2003-04-24

Family

ID=9924009

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/004657 WO2003033987A1 (en) 2001-10-17 2002-10-14 Barrel conversion for a gun

Country Status (5)

Country Link
US (1) US20050028421A1 (en)
EP (1) EP1436566A1 (en)
CA (1) CA2463820A1 (en)
GB (1) GB2381060A (en)
WO (1) WO2003033987A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006120421A1 (en) 2005-05-10 2006-11-16 Utm Ip Limited Training cartridge, gun barrel insert & assembly
US7225741B2 (en) 2004-01-22 2007-06-05 Pdt Tech, Llc Reduced energy training cartridge for self-loading firearms
US7278358B2 (en) 2004-01-22 2007-10-09 Pdt Tech, Llc. Non-lethal marking bullet for related training cartridges
WO2019166787A1 (en) * 2018-03-02 2019-09-06 Utm Liimited Conversion kit having interchangeable barrel liners

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7316093B2 (en) * 2002-10-21 2008-01-08 Kightlinger Paul E Firearm and munitions kit
US7562478B1 (en) * 2007-01-24 2009-07-21 Laszlo Vastag Firearm conversion system and caliber reducer with hammer safety lock
DE102011080288A1 (en) * 2011-08-02 2013-02-07 Heckler & Koch Gmbh Maneuver cartridge device and suitable self-loading firearm
US8528243B1 (en) * 2012-07-10 2013-09-10 Gaston Glock Pistols and methods of manufacture
DE102015111066B4 (en) * 2015-07-08 2021-02-04 Ansgar Mette Reduction system for a handgun
WO2019113591A1 (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
DE102019000416A1 (en) * 2019-01-23 2020-07-23 Schmeisser Gmbh Barrel and change system for a handgun, and method for operating a handgun

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH99973A (en) * 1922-06-10 1923-07-02 Mueller Bernhard Mission barrel for firearms.
DE730030C (en) * 1939-08-16 1943-01-06 Hugo Schmeisser Automatic firearm in which the barrel is narrowed by an insert in front of the cartridge in order to increase the gas pressure when firing with blank cartridges
GB625699A (en) * 1944-09-15 1949-07-01 Ansaldo Sa Improvements in or relating to fire-arms
US4459774A (en) * 1981-05-05 1984-07-17 Serge Ferretti Hand weapon caliber reducers

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3525172A (en) * 1968-07-05 1970-08-25 A I M Magnum Corp Rifled bore construction for a gun barrel
US3805434A (en) * 1972-07-11 1974-04-23 F Sudano Barrel adapter for shot gun to rifle conversion
US4546564A (en) * 1982-04-28 1985-10-15 Costa Anthony A Rifled bore construction for a gun barrel
US4660312A (en) * 1983-08-15 1987-04-28 Costa Anthony A Rifled gun barrel having smooth bore section
DE3729412A1 (en) * 1987-09-03 1989-03-16 Mauser Werke Oberndorf INSERT ARM PIPE WITH ADJUSTMENT
US5983772A (en) * 1997-08-28 1999-11-16 Reynolds; George L. Subcaliber device/blank firing adaptor for blowback or recoil operated weapons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH99973A (en) * 1922-06-10 1923-07-02 Mueller Bernhard Mission barrel for firearms.
DE730030C (en) * 1939-08-16 1943-01-06 Hugo Schmeisser Automatic firearm in which the barrel is narrowed by an insert in front of the cartridge in order to increase the gas pressure when firing with blank cartridges
GB625699A (en) * 1944-09-15 1949-07-01 Ansaldo Sa Improvements in or relating to fire-arms
US4459774A (en) * 1981-05-05 1984-07-17 Serge Ferretti Hand weapon caliber reducers

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7225741B2 (en) 2004-01-22 2007-06-05 Pdt Tech, Llc Reduced energy training cartridge for self-loading firearms
US7278358B2 (en) 2004-01-22 2007-10-09 Pdt Tech, Llc. Non-lethal marking bullet for related training cartridges
US7621208B2 (en) 2004-01-22 2009-11-24 Federal Cartridge Company Reduced energy training cartridge for self-loading firearms
US7984668B2 (en) 2004-01-22 2011-07-26 Federal Cartridge Company Reduced energy training cartridge for self-loading firearms
WO2006120421A1 (en) 2005-05-10 2006-11-16 Utm Ip Limited Training cartridge, gun barrel insert & assembly
WO2019166787A1 (en) * 2018-03-02 2019-09-06 Utm Liimited Conversion kit having interchangeable barrel liners
US11274896B2 (en) 2018-03-02 2022-03-15 Utm Limited Conversion kit having interchangeable barrel liners

Also Published As

Publication number Publication date
EP1436566A1 (en) 2004-07-14
US20050028421A1 (en) 2005-02-10
GB0124908D0 (en) 2001-12-05
CA2463820A1 (en) 2003-04-24
GB2381060A (en) 2003-04-23

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