I received an e-mail from Steve at Adco Firearms today. He finally received some complete 9mm Rock River Arms CAR A4 uppers. I ordered one through him in September. He shipped it to me Friday along with a RRA 9mm hammer.
So next week, I should be able to assemble the carbine and give it a whirl. I have a ARMS #40 rear sight to mount on the flattop. I'm going to keep it simple for now. The shelves are loaded with 9mm ammunition, and it doesn't cost near as much to replace as .223 Remington.
I'm glad I ordered the parts, top end and CProducts magazines before Nov. 4. The NRA-ILA offers this note of explanation. Of course, the original page referred by the NRA-ILA, http://change.gov/agenda/urbanpolicy, "is not available right now."