Muzzle Threading for Brake

In this service we indicate the barrel bore to less than .0002" using a long stem dial indicator reading directly off the lands and grooves in the bore. This is the most accurate way to ensure that the last 2+ inches of the barrel's bore will be concentric with the muzzle threads and the mating shoulder on the barrel perfectly square. This is especially important for suppressor use as the slightest error can lead to a damaged suppressor and costly repairs.