The FRT is just a legal opinion. Not the law.
Nothing about C71 changes the fact that any gun cam go prohib at any time. The 180b is NR. The 180C has more in common with the B then the original. Neither the B or the C fits a rational interpretation of variant or modified version. There will be a line up of people willing to put this in front of a judge, and believe me if all goes for naught dont worry about a refund. There will be a line up of people willing to buy it from you at a premium.
PS not a technical question