Being threaded does not make it non-compliant. Threaded muzzles are only a problem if they're on pistols. There are clamp on style brakes, but none made for the AR that I can find. You probably could get one made, but it will more than likely be real pricey.

@Muss-pretty much like you would a normal grip. Only difference is your thumb doesn't wrap around. Similar to what you would use if you were shooting a chassis rifle in PRS competition. It's a little weird at first, but rifle is still controllable.

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