Warlord,
I've done some additional research, and DavidC's answers should be "It depends" instead of "No."
* RE the 94 ban, as long as the rifle was in an AW configuration prior to 9/14/94, it is a legal preban, and may possess any legal evil parts provided the conditions of the 89 ban are maintained. So the rifle needed to possess a bayo lug, threaded barrel, or flash hider on 9/13/94.
* RE the 89 ban, so long as any replacement or additional parts are of U.S. manufacture, they are completely legal, assuming they are not banned because of the 94 law.
This is my understanding. YUMV (Your Understanding May Vary)