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Bob's Rifles, or Sporterizing
some Turks - 5
Now on to the chamber end of the barrel. Most rifle barrels screw into the receiver until the end of the barrel OR a shoulder on the barrel tightens against a mating shoulder in the receiver. The Large Ring Mauser is just about the only receiver where the end of the barrel AND a shoulder on the barrel tighten simultaneously. This "Two Shoulder" method is described in every gunsmithing text I have ever read, form Howe's book published in the Twenties to Jerry's book published in 199x. None of these were published in Turkey! Not one of the Turks that I have un-barreled showed signs of both surfaces being mated. Some have mated the end of the barrel with the inner shoulder of the receiver while others have mated the barrel shoulder with the front of the receiver, but never both.
Here we have a receiver held in a receiver wrench for no good reason. Using a depth micrometer, I am measuring the distance from the front of the receiver to the internal torque shoulder.
Now the barrel is mounted in the lathe and a very light cut has been taken on the face of the shoulder of the barrel. The distance from this shoulder to the end of the barrel is carefully measured. The end of the barrel will be cut until this distance is equal to the distance from the receiver face to the inner torque shoulder.
The end has been cut. Since both distances are equal, both the barrel shoulder and the end of the barrel will touch their mating surfaces in the receiver at the same time when the barrel is tightened into the receiver.