Hey Llyod-
I have a RRA M4 Entry model, and the best way to describe my satisfaction with it is to say it IS my favorite gun that I own. And I own a few nice ones. I went with the entry model because it was the best looking postban M4 that I have seen. It has the 16 in. barrel with the pressed on flash hider that gives it a nice look. Fit and finish are perfect.
I put one of their post-ban tele stocks on mine (I didn't want that entry stock) and I had them chrome-line the barrel. I got the sense that they would be willing to meet your own specifications. They seemed good that department.
I would have gone through a person besides of calling RRA directly, but no one had exactly what I wanted at the time, so I did go straight to RRA. Unless they've gotten better about e-mails, don't even try it. I had to call them. That was a little annoying.
The only complaint that I have with RRA is that they are SLOW. I was told that the chrome barrel would take about 4 weeks, and the gun another 3. And it did take about 2 months for them to ship it out. I think at the time they had just gotten the chrome M4 barrels so maybe now there wouldn't be such a delay.
Overall I can tell you that my experience with RRA was great, despite the wait. The wait was worth it- what a nice gun. I have seen some Bushys and some Colts since I got mine, and they are nice too, but don't get me wrong, I like my RRA M4 better. If you go with the RRA, you made a wise choice. Others across AR-15.com seem to echo the same words of praise. Have fun with your new gun!