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I know how to thread, but how do you time a flash suppressor?
On the AR, the bottom of the cage is solid so as to prevent the blast from disturbing the dust. I suppose it helps with recovery for a follow up shot too.
So, how does one ensure that the solid bottom is at 6 o'clock? Just stop rotating it when it's in position? I'm also concerned about threading the barrel excessively.
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If you are cutting the threads, you can also cut the barrels shoulder so that there is no crush washer or shims needed.
I do this for customers as a service when they are having me thread a barrel or assemble a rifle.
On 1/2-28 threads, 0.001" of cut gives you 10 degrees of rotation.
When checking by hand as you cut the shoulder, stop about 10-20 degrees short as the muzzle brake will turn another 10-20 degrees when you wrench it on there tight.
I do this stuff for a living if anyone else needs help threading a barrel.