There are a few different ways to time a muzzle brake. One way is to use the washers that come with the brake. Another way is to use a set of calipers to measure the distance between the brake and the barrel, and then add or subtract shims as needed to get the brake in the correct position.
Another option is to use an alignment rod. This is a piece of metal or plastic that is inserted down the barrel and against the muzzle brake. The idea is that you adjust the position of the brake until it’s parallel with the rod. Once it’s in line, you can add or subtract shims as needed to keep it in position.
Whichever method you choose, the goal is to get the muzzle brake aligned so that it’s level with the barrel.
Keep in mind that it’s important to be as precise. A small mistake can result in increased recoil and make your gun more difficult to control. If you’re unsure of your ability to do this correctly, it’s best to consult a professional gunsmith.