Don't sell it, you'll regret it once it's gone. Fortunately for me I sold mine to a really good friend because I I regretted selling it right away and hounded him for two years till I got it back. Now it's on my never sell list. I buy and sell other non restricted semi auto 233's but the 180 and my NR ACR stay.
This is why you have to be very careful when importing one. If the factory brake was cut off and then the barrel was threaded for a different muzzle device it will be restricted. If the muzzle device is part of the barrel it counts as barrel length, Herron Arms was doing this with their non restricted ACR conversions for guys that wanted the shortest non restricted they could get.