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Barrels that are threaded for a muzzle break, flash-hider or sound suppressor may be one of many different thread pitches, and the correct diameter and thread pitch is an important consideration. There is no "one" standard since there are so many barrel makers, styles and contours. That being said, a standard contour barrel, regardless of the caliber, might be expected to have a 1/2" diameter and a 28 thread-pitch. When you see the barrel thread or muzzle-break specs, it would state 1/2x28. So, be careful when you order your muzzle break and make sure it is the correct diameter and thread pitch. Also, you'll likely need a crush washer, so don't forget to order one and apply the correct torque when installing.
Common Sizes are;
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