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Before you buy a muzzle brake, flash hider, thread protector or adapter, you need to know two things about your barrel: its thread pitch and its caliber. This reference covers the thread pitches most often found on rifles and pistols sold in the US, how to read the notation, and how to check your own barrel. How to read thread pitch Muzzle threads are written as a diameter and a pitch. Imperial (inch) threads are written as outside diameter in inches by threads per inch (TPI). 1/2x28 means a 1 …