hey guys I'm new here....seeking advice/opinions of those who are experienced building ar 10s. my question is are they as hard to build as some people make it out to be? not that the process of putting it together is hard, but the process of buying parts that all fit together. i was under the impression that if you have a dams upper/lower then you would want to get a dams barrel/bcg/etc, and its a simple as that. from what some other people have told me on some other forums its not that simple and a lot of parts don't fit together right. opinions?