It seems like I read someplace that Professional Ordinance makes a Carbon 15 upper (similar to the top half of their Carbon 15 rifle) that works on a standard AR-15 lower receiver. It is supposed to be quite a bit lighter than most other AR configurations. I can't seem to find any information about this - only about the complete Carbon 15 rifles (which we can't buy here in California). Anybody know anything about these? Thanks.
Doug
Doug