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Old May 7, 2012, 10:19 PM   #3
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 24,940
He may have purchased a gunsmith fit barrel that's intentionally made to be a slightly oversized so that it can be precisely fit to the gun to improve accuracy.

The outside diameter of the barrel of my CZ 75B is 0.502" at the muzzle.

The inside diameter of the barrel opening in the slide is 0.508"
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