Multi Bore Barrel for Pistol

Abstract

A gun barrel that has a proximal chamber end, a distal muzzle end, and an internal bore bounded by a bore wall, the internal bore having a first rifled bore section proximate to the proximal chamber end of the barrel, a second rifled bore section at the distal muzzle end of the barrel, and a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section, wherein at least one of the first rifled bore section and the second rifled bore section have straight groove rifling.

What is claimed is: 
     
         1 . A gun barrel, comprising:
 a proximal chamber end and a distal muzzle end;   an internal bore bounded by a bore wall, the internal bore having:
 a first rifled bore section proximate to the proximal chamber end of the barrel; 
 a second rifled bore section at the distal muzzle end of the barrel; and 
 a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section; 
   wherein at least one of the first rifled bore section and the second rifled bore section have straight groove rifling.   
     
     
         2 . The gun barrel of  claim 1 , wherein the internal bore has a cartridge chamber at the proximal chamber end of the gun barrel, the cartridge chamber having a breach at the proximal chamber end of the gun barrel and a feed ramp connected to the breach. 
     
     
         3 . The gun barrel of  claim 1 , wherein:
 the gun barrel has a longitudinal axis extending between the proximal chamber end and the distal muzzle end;   the first rifled bore section has a first major diameter;   the second rifled bore section has a second major diameter;   the reducing section has a large end connected to the first rifled bore section and a small end connected to the second rifled bore section, the large end of the reducing section has a larger cross-section area measured perpendicular to the longitudinal axis than a small end cross-section area measured perpendicular to the longitudinal axis.   
     
     
         4 . The gun barrel of  claim 3 , wherein the cross-section area of the reducing section as measured perpendicular to the longitudinal axis decreases linearly. 
     
     
         5 . The gun barrel of  claim 1 , wherein the second rifled bore section is removably connected to the reducing section. 
     
     
         6 . The gun barrel of  claim 1 , having an overall length measured from the proximal chamber end of the gun barrel to the distal muzzle end;
 wherein the first rifled bore section has a length that is in a range of 40-80% of the overall length of the gun barrel.   
     
     
         7 . The gun barrel of  claim 1 , having an overall length measured from the proximal chamber end of the gun barrel to the distal muzzle end;
 wherein the second rifled bore section has a length that is in a range 5-45% of the overall length of the gun barrel.   
     
     
         8 . The gun barrel of  claim 1 , having an overall length measured from the proximal chamber end of the gun barrel to the distal muzzle end;
 wherein the reducing section has a length that is in a range of 15-55% of the overall length of the gun barrel.   
     
     
         9 . A pistol, comprising:
 a gun barrel having:
 a proximal chamber end and a distal muzzle end; 
 an internal bore bounded by a bore wall, the internal bore having:
 a first rifled bore section proximate to the proximal chamber end; 
 a second rifled bore section at the distal muzzle end of the barrel; and 
 a reducing section distal to the first rifled bore section, and connecting the first rifled bore section and the second rifled bore section; 
 
   wherein at least a portion of the reduced section is without groove rifling.   
     
     
         10 . The pistol of  claim 9 , wherein:
 the gun barrel has a longitudinal axis extending between the proximal chamber end and the distal muzzle end;   the first rifled bore section has a first major diameter;   the second rifled bore section has a second major diameter;   the reducing section has a large end connected to the first rifled bore section and a small end connected to the second rifled bore section, the large end of the reducing section has a larger cross-section area measured perpendicular to the longitudinal axis than a small end cross-section area measured perpendicular to the longitudinal axis.   
     
     
         11 . The pistol of  claim 9 , wherein the internal bore has a cartridge chamber at the proximal chamber end of the gun barrel, the cartridge chamber being connected to a proximal side of the first rifled bore section. 
     
     
         12 . The pistol of  claim 11 , wherein the cartridge chamber is bounded by a substantially cylindrical wall. 
     
     
         13 . The pistol of  claim 11 , wherein the cartridge chamber having a breach at the proximal chamber end of the gun barrel and a feed ramp connected to the breach. 
     
     
         14 . The pistol of  claim 11 , wherein a combined length of the cartridge chamber, the first rifled bore section, the second rifled bore section, and the reducing section is in a range of 3 to 10 inches. 
     
     
         15 . A gun barrel, comprising:
 a proximal chamber end;   a distal muzzle end;   an overall length measured from the chamber end to the muzzle end of the gun barrel;   a first rifled bore section proximate to the proximal chamber end,   a second rifled bore section at the distal muzzle end; and   a reducing section distal to the first rifled bore section and connecting the first rifled bore section and the second rifled bore section;   wherein the reducing section has a length in a range of 15-55% of the overall length of the gun barrel.   
     
     
         16 . The gun barrel of  claim 15 , wherein the first rifled bore section has a length in a range of 40-80% of the overall length of the gun barrel. 
     
     
         17 . The gun barrel of  claim 15 , wherein the second rifled bore section has a length in a range of 5-45% of the overall length of the gun barrel. 
     
     
         18 . The gun barrel of  claim 15 , wherein the first rifled bore section has a first diameter, the second rifled bore section has a second diameter, and the second diameter is in a range of 70-85% of the first diameter. 
     
     
         19 . The gun barrel of  claim 15 , comprising a cartridge chamber at the chamber end, wherein the cartridge chamber is detachable from the first rifled bore section. 
     
     
         20 . The gun barrel of  claim 15 , wherein the second rifled bore section is removably connected to the reducing section.