Patent ID: 7383656

Claim:
A method for manufacturing double barrel gun barrels, the method comprising: providing an elongated solid metal stock material having a length dimension and a first end and a second end, said solid metal stock material being of sufficient length to produce a double barrel gun barrel; forming a first pair of opposed index markers at both said first end and said second end of the solid metal stock material; forming a second pair of opposed index markers at both the first end and the second end of the solid metal stock material, the second pair of index markers being spaced from the first pair of index markers at both the first end and the second end of the solid metal stock material, each said first and second index markers at said first end and said second end of the solid metal stock material providing indices for subsequently positioning said metal stock material for further processing; forming a first projectile hole by boring through the solid metal stock material, the location of said first projectile hole being defined along its said length dimension by said first and second index markers at said first and second ends; and then forming a second projectile hole by boring through the solid metal stock material, the location of said second projectile hole also being defined along its said length dimension by said first and second index markers at said first and second ends, and spaced apart from said first projectile hole wherein said metal stock material carrying said first projectile hole and said spaced apart second projectile hole is machine profiled using machining equipment selected from cutting tools, grinding tools, material removing equipment, and polishing equipment, and combinations thereof forming a first external guide along the longitudinal length of the solid metal stock material; forming a second external guide along the longitudinal length of the solid metal stock material, said second external guide being spaced from said first external guide, and at an angle relative to said first external guide; forming a first projectile hole by boring through the solid metal stock material, the location of said first projectile hole being defined along its said length dimension by said first and second index markers at said first and second ends and aligned with said first external guide; and then forming a second projectile hole by boring through the solid metal stock material, the location of said second projectile hole being defined along its said length dimension by said first and second index markers at said first and second ends and aligned with said second external guide.