Based on some recent 922(r) reading, threading a barrel isn't a 922(r) feature, however 'capacity to accept' a flash hider is, and a flash hider itself absolutely is.
I would be somewhat concerned about that, although the ATF doesn't give hard and fast 922(r) rules. Your best bet is to get a written opinion from ATF on your desired configuration, and if they rule favorably, that configuration would be good for all.
I would be somewhat concerned about that, although the ATF doesn't give hard and fast 922(r) rules. Your best bet is to get a written opinion from ATF on your desired configuration, and if they rule favorably, that configuration would be good for all.

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