I'm with you Vincent, just imagine being arrested and charged as an International arms smuggler for shipping a trigger housing!!!! But...but...Bizio said they do it all the time on EBay!!!!........ *(a) Nonautomatic, semi-automatic and fully automatic firearms to caliber .50 inclusive, and all components and parts for such firearms. (See § 121.9 and §§ 123.16-123.19 of this subchapter.)