That was back when suppressors were an NFA item.
They are still NFA items and the laws in the NFA that say that you must engrave a suppressor/SBR/SBS when it is made are still on the books for everyone but Jensen plaintiffs, you just no longer have to submit a Form 1 or Form 4 or have them registered in the NFRTR in your name.
Specifically, these are the laws that were enjoined as applied to Suppressors, SBRs, and SBSes (and AOWs for SilencerShop Plaintiffs only) under both SilencerShop/Jensen:
• 26 U.S.C. § 5812(a)–(b): Transfering NFA Firearms
• 26 U.S.C. § 5822: Making NFA Firearms
• 26 U.S.C. § 5841(a)–(c), (e);• Registration of NFA Firearms
26 U.S.C. § 5861(b)–(f);• Prohibited Acts of NFA Items (Possess one in violation of the NFA, transfer or make one in violation of the NFA)
27 C.F.R. § 479.62(a)–(d); Regulations about the Form 1 process
27 C.F.R. § 479.84(a)–(d). Regulations about the Form 4 process
These are the additional laws that were enjoined for Jensen plaintiffs only:
• 26 U.S.C. § 5842(b); NFA Serial Number Requirement
• 26 U.S.C. § 5861(i). Prohibition on possessing NFA items without a serial number