Went down to the local shop and had them order me the Colt 6920 HBPW. They couldn't find a SOCOM or an FN-15. For $790 I'm going to go ahead and order an FN online in addition to the Colt.
Their resident AR assembler caught the tail end of me talking about the FN and he was telling me how Colt has really gone down hill and FN is way better, which may be true, I don't know. But then I told him what I was going for and he said they had a nice M4 barrel they just got in. He shows it to me and it's an Anderson barrel. I was really afraid of something like that which is why I didn't just have them put one together for me. It also wasn't a heavy profile like what I want. I don't know if he only heard "M4" and not "M4A1" or if he just doesn't know or probably both. I didn't know about the different profiles before starting this thread and I bet he's never seen a legit M4A1 in person.