I recently have caught the AR-15 bug. Looking at my options, I am quite a bit overwhelmed. One of the thoughts I was entertaining was building up a compact lightweight carbine. I was wondering about a Cavalry arms lower. Obviously I have heard about their whole ATF raids/problems. Are these lowers still being sold? Am I crazy for being interested in a plastic lower? Anyone have any experience with them? I will probably be purchasing a traditional AR anyways but this looks like a fun project. Any thoughts are appreciated.