BigRed3588
Sharpshooter
I too suspect that this fishing expedition will end with a return to the previous rules, but that they'll either give an option to engrave and keep your SBR (they did get the federal registration they wanted) or retract the application and go back to braced.
I can’t see them letting people keep the registration without proof of engravement, so I expect them to retract the application and force people to start over and pay for the stamp.