6315's flash suppression performance is akin to that of the A2, given the same length and diameter. We opened up the internal cone a bit to increase the volume of air inside, but it didn't have any significant affect on flash suppression.
A dedicated flash suppressor would do a better with 10.5 or 11.5, but it'd almost certainly be longer and with open prongs, and will not provide any muzzle rise compensation abilities.
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