Keep in mind these were meant to be a Vietnam War commemorative collectible not a retro clone like we know them today. When these were made I doubt there were many people out there worried about cloning a rifle that was still for the most part in active service. I also have to say that the many Vietnam Veterans he has shown it to have been quite impressed and pleased by it, especially considering that at the time this was made not many people or organizations were doing much to acknowledge the Vietnam War or Vietnam Veterans at all.
Below is a repeat of a previous post I made on these rifles last year along with a link to it:
http://www.ar15.com/forums/topic.html?b=3&f=123&t=704031
Though I have been building retro inspired rifles for some time now my Dad who is a Vietnam Veteran and carried an actual M16 in Vietnam (1968-1969) did not have a retro type rifle. Unlike myself he is not much of a gun collector or enthusiast but last year he purchased this American Historical Foundation / B.F.I. (Bushmaster) Vietnam War Commemorative M16 (Semi-Auto) rifle pictured below. These commemorative rifles were made in the 1980s and have been talked about in the forum in past, though I did not see many pictures, so I figured I would take some of his rifle and discuss it a bit. They made 1,500 of these and this particular rifle is one of the earlier ones having a serial number within the first 500. It was also made (atleast the A1 style lower receiver for sure) during the few year time period in the 1980s while Bushmaster was located in Portland, Maine. The rifle does appear to have been fired but is showing very little use and is still in very nice condition. I have not completely torn it apart but just in a quick look I have found the following:
A1 style (Anchor Harvey forged) upper receiver
A1 style lower receiver
Pencil barrel with non "F" marked front sight base (did not see any barrel markings yet)
AR15 bolt carrier
Later style ejection port door cover
Early Colt .223 marked 20-round magazine
It appears that all the parts and components were brand new prior to assembly including the commemorative modified and texture painted furniture.