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Bob's Rifles, or Sporterizing some Turks - 3
After drilling, tapping and de-burring the holes for the scope base, we move to lapping the locking lugs. Lapping insures that both locking lugs are bearing evenly on the lug areas of the receiver. This will improve accuracy and insure that both lugs are sharing the forces of firing equally.
A tool is required:
This is a homemade tool, the small round piece sticking out on the left is spring loaded, and can be pushed into the threaded area.
The tool is screwed into the front of the receiver where the barrel would go, the spring-loaded plunger pushes against the bolt.
Using a "instant" bluing compound we blue JUST the rear face of both locking lugs. A small dab will do. Then a LITTLE bit of 400 grit grinding paste is placed on the rear of both lugs, the bolt is inserted into the receiver, the tool is screwed into the receiver threads, and the bolt handle is rocked up and down ONLY ABOUT 15 DEGREES. The grinding compound will chew away the lug and it's mating surface. After about 10 min of rocking and two applications of grit, the bolt looked like this:
On one side, and like this:
The areas where the bluing is worn away are in firm contact with the receiver while the areas that are still blued are not. The lapping process was continued until almost all of the bluing on both lugs was removed.
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