Furthermore, It hasn't even made past the ninth circuit of appeals, but numbnuts here "fritz", is claiming its made it all the way to the US sepreme court.
Read on legal challenges.
egal challengePlaintiffs filed suit in support of the law, in federal district court, on October 1, 2009. These plaintiffs are the Montana Shooting Sports Association, the Second Amendment Foundation, and MSSA president Gary Marbut. The legal complaint states that Marbut "wishes to manufacture and sell small arms and small arms ammunition to customers exclusively in Montana, pursuant to the MFFA, without complying with the NFA or the GCA, or other applicable federal laws."[8][9][10][11] One firearms manufacturer in Kalispell, Montana has stated that because they cannot afford to litigate, they do not plan to sell their AR-15s or AR-10/AR-15 family receivers to private parties without a Form 4473. But they did state that they intend to do so, once a court ruling clears the way.[12]
On September 29, 2010, U.S. District Court Judge Donald Molloy dismissed the suit "for lack of subject matter jurisdiction and failure to state a claim."[13]
The Plaintiffs have filed an appeal[14] with the United States Court of Appeals for the Ninth Circuit.