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(BTW, it is a muzzle BRAKE)

Will depend on the make, barrel length, etc.

If the barrel will be below 16 inches without a flash suppressor, they must either be pinned/ silver soldered/ brazed in place, OR the rifle registered with the BATFE as an SBR.
 

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Most likely threaded 1/2-28, some minis are 9/16-24.
 
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