How to Crown a Barrel

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Often times barrels with threaded muzzles use a flat 90° face but they come with a threaded protector cap. That way if you want to shoot the rifle without it's normal muzzle attachment, you just screw on the protector cap to protect the barrel threads and the crown.

Even though the end of the barrel is faced flat notice that the edge of the bore is just slightly broken and then lapped smooth.