As far as I know, no suit has failed. Only the initial move to get a temporary restraining order in federal district court has failed. That failure is in the cause of action cited in the link I provided, i.e. the combined cases of FPC v. Whitaker and Guedes v. BATFE.Well you should clarify that as one of the suits has failed the other I think 2 are still in court.
There's still time to get a restraining order on appeal but I'm betting that's unlikely.
I took my rifle to a gunsmith today and dropped it off. I'll pay for the removal of the stock, thus beginning the paper trail of my expenses incurred to comply with the new regulation. If the TRO is obtained, I'm out a few bucks and I'll hang onto my stock. If the TRO is not obtained before the deadline, I will surrender the stock at the local ATF field office and get a receipt.
In that case, I'm thinking long term. If the side of the angels loses, I'm out a few bucks but the ATF will have my stock and I need not fear prosecution. If we ultimately win, I can go back to the ATF and ask for my stock back. If they've destroyed it, I will have the documentation necessary to take them to small claims court and ask for compensation for my time, expenditures for compliance, and the value of the stock.
Whether that could be of any real-world utility I tend to doubt. Still, I'd be tickled to have a judgement against the ATF. (Yes, I know the hurdles required to sue the government. I got sued plenty before I retired so I've been down this road, albeit from the other direction, several times in the past.)
As of now, this whole thing could go any number of directions. I'm just trying to envision them all and prepare myself to deal, legally, with any foreseeable outcome.