Barrels

Manufacturing process

1. Straightening of the barrels

   The first step to a Bergara barrel starts with a cylindrical bar, checking and straightening each barrel to a deviation of less than 0.10mm. The analysis of this aspect is important for its influence in the grouping.

2. Deep hole drilling

   Once the steel bar is straightened, it moves on to the deep hole drilling process.

3. Barrel Honing

   Most barrel makers go from deep home drilling to reaming and then on to rifling. The reaming process leaves tool marks that are 90 degrees to the rifling. Bergara incorporates the honing process. These honing spindles utilize dimanond-tipped bits that polish the barrel's interior surface to a mirror-like finish with a uniformity of the bore which does not vary more than 0.002mm for the entire length of the barrel.

4. Button rifling - Stress Relieving

   The rifling process is performed by button or olive method, that means a cold rolling of the inner of the barrel. The barrel copies the shape of the button meanwhile it is drawn through the barrel, creating by this way the appropriate lands and grooves at the required twist rate for each caliber. Then it goes on to the stress relieving of the steel.