Barrel conversion for a gun

Abstract

A barrel conversion for a gun comprises; an external, peripheral surface suitably configured to fit and cycle the gun whose barrel ( 1 ′) 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.

1 . A barrel conversion device for a gun comprising an external peripheral surface configured to fit and to cycle the gun whose barrel is to be converted, and a stepped internal bore, wherein the stepped internal bore includes 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 . The barrel conversion device as claimed in  claim 1 , wherein the external peripheral surface comprises an external surface of the original barrel of the gun to be converted.  
   
   
       3 . The barrel conversion device as claimed in  claim 1 , wherein the external peripheral surface forms part of a retro-fitted barrel.  
   
   
       4 . The barrel conversion device as claimed in  claim 1 , wherein the gun to be converted is a semi-automatic pistol and the rifled bore portion has a length between about 45 mm and about 80 mm.  
   
   
       5 . The barrel conversion device as claimed in  claim 4 , wherein the rifled bore portion has a length between about 50 mm and about 75 mm.  
   
   
       6 . The barrel conversion device as claimed in  claim 4 , wherein the rifled bore portion has a length of about 65 mm.  
   
   
       7 . The barrel conversion device as claimed in  claim 1 , wherein the rifled bore portion is angled relative to the longitudinal axis of the barrel.  
   
   
       8 . The barrel conversion device as claimed in  claim 1 , wherein at least the first rifled portion of the stepped internal bore comprises a bored liner configured to be inserted into an existing gun barrel.  
   
   
       9 . A gun having a barrel conversion device as claimed in  claim 1 .  
   
   
       10 . (cancelled)  
   
   
       11 . (cancelled)