I know that the Military Armament Corporation 10 is different, but most folks think that the Mac10 is a M11/9 is a M10/45 is a MAC-10 is a, well, you get the idea.
Class 3/Title II firearms are legal to own, with the correct taxes paid, if they are allowed in your state. Here in VA, they are with no special licenses required, you just have to do 2 things:
1. Have the Firearm transfered to you on ATF Form 4 and pay the tax.
2. Register said firearm with the State Police. (This is cause of a law passed
before the NFA! Thank you NRA!)
Once that is done, you are cool.
TR