The site on which I saw this is www.leftiesinc.com.
ALSO, according to the site, the state legislature in Michigan is halfway to passing a bill to allow short-barreled rifles and shotguns. I just thought some folks might like to know that.
更新1:
338 Edge- The SBR and SBS are legal under Federal law, with the appropriate paperwork.
更新2:
Fatefinger- I think you may have missed the point. The shorties are currently illegal in MI, and the state legislature is working to make them legal, presumably under the terms of NFA '34.