If its in AR config then you'd have a few hoops to jump through. It took well over a year to bring in my AR and that was back in 2005 when US laws were a lot more relaxed. Now with tougher US state department regulations etc...I'd hate to imagine how long it may take?
If it were me, personally I'd just look at Digits website or get Trueflite to make you a barrel as then you could have it next week. Alternatively gunsmith like Arthur Cleland are doing cool things with Shilen barrels, turning them down to suit AR's and getting some pretty outstanding accuracy from them.
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