that certainly is part. "ar" are not initials for assault rifle
however this article with its many links is an interesting read on the origin, intent and distribution of the ar15 as well as the various and opposing views the article writer includes. the link to his other article is very interesting
https://www.theatlantic.com/notes/2017/11/on-the-military-and-civilian-history-of-the-ar-15/545660/
